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The Expression of Emotion in Man and Animals

C >> Charles Darwin >> The Expression of Emotion in Man and Animals

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[21] `Dictionary of English Etymology,' p. 403.

Chameleons and some other lizards inflate themselves when angry.
Thus a species inhabiting Oregon, the _Tapaya Douglasii_, is slow
in its movements and does not bite, but has a ferocious aspect;
"when irritated it springs in a most threatening manner at
anything pointed at it, at the same time opening its mouth
wide and hissing audibly, after which it inflates its body,
and shows other marks of anger."[22]

Several kinds of snakes likewise inflate themselves when irritated.
The puff-adder (_Clotho arietans_) is remarkable in this respect;
but I believe, after carefully watching these animals, that they
do not act thus for the sake of increasing their apparent bulk,
but simply for inhaling a large supply of air, so as to produce
their surprisingly loud, harsh, and prolonged hissing sound.
The Cobras-de-capello, when irritated, enlarge themselves a little,
and hiss moderately; but, at the same time they lift their heads aloft,
and dilate by means of their elongated anterior ribs, the skin on
each side of the neck into a large flat disk,--the so-called hood.
With their widely opened mouths, they then assume a terrific aspect.
The benefit thus derived ought to be considerable, in order to compensate
for the somewhat lessened rapidity (though this is still great)
with which, when dilated, they can strike at their enemies or prey;
on the same principle that a broad, thin piece of wood cannot
be moved through the air so quickly as a small round stick.
An innocuous snake, the _Trovidonotus macrophthalmus_,
an inhabitant of India, likewise dilates its neck when irritated;
and consequently is often mistaken for its compatriot, the deadly
Cobra.[23] This resemblance perhaps serves as some protection
to the Tropidonotus.


[21] See the account of the habits of this animal by Dr, Cooper, as quoted
in `Nature,' April 27, 1871, p. 512.

[22] Dr. Gunther, `Reptiles of British India,' p. 262.

Another innocuous species, the Dasypeltis of South Africa,
blows itself out, distends its neck, hisses and darts at an
intruder.[24] Many other snakes hiss under similar circumstances.
They also rapidly vibrate their protruded tongues; and this
may aid in increasing their terrific appearance.

Snakes possess other means of producing sounds besides hissing.
Many years ago I observed in South America that a venomous Trigonocephalus,
when disturbed, rapidly vibrated the end of its tail, which striking
against the dry grass and twigs produced a rattling noise
that could be distinctly heard at the distance of six feet.[25]
The deadly and fierce _Echis carinata_ of India produces "a
curious prolonged, almost hissing sound in a very different manner,
namely by rubbing "the sides of the folds of its body against
each other," whilst the head remains in almost the same position.
The scales on the sides, and not on other parts of the body,
are strongly keeled, with the keels toothed like a saw;
and as the coiled-up animal rubs its sides together, these grate
against each other.[26] Lastly, we have the well-known case of the
Rattle-snake. He who has merely shaken the rattle of a dead snake,
can form no just idea of the sound produced by the living animal.
Professor Shaler states that it is indistinguishable from that
made by the male of a large Cicada (an Homopterous insect),
which inhabits the same district.[27] In the Zoological Gardens,
when the rattle-snakes and puff-adders were greatly excited at
the same time, I was much struck at the similarity of the sound
produced by them; and although that made by the rattle-snake is louder
and shriller than the hissing of the puff-adder, yet when standing
at some yards distance I could scarcely distinguish the two.
For whatever purpose the sound is produced by the one species, I can
hardly doubt that it serves for the same purpose in the other species;
and I conclude from the threatening gestures made at the same time
by many snakes, that their hissing,--the rattling of the rattle-snake
and of the tail of the Trigonocephalus,--the grating of the scales
of the Echis,--and the dilatation of the hood of the Cobra,--
all subserve the same end, namely, to make them appear terrible
to their enemies.[28]


[24] Mr. J. Mansel Weale, `Nature,' April 27, 1871, p. 508.

[25] `Journal of Researches during the Voyage of the "Beagle,"
' 1845, p. 96. I have compared the rattling thus produced
with that of the Rattle-snake.

[26] See the account by Dr. Anderson, Proc. Zool. Soc. 1871, p. 196.

[27] The `American Naturalist,' Jan. 1872, p. 32. I regret that I cannot
follow Prof. Shaler in believing that the rattle has been developed,
by the aid of natural selection, for the sake of producing sounds which
deceive and attract birds, so that they may serve as prey to the snake.

It seems at first a probable conclusion that venomous snakes,
such as the foregoing, from being already so well defended
by their poison-fangs, would never be attacked by any enemy;
and consequently would have


{note [27] continued} I do not, however, wish to doubt
that the sounds may occasionally subserve this end.
But the conclusion at which I have arrived, viz. that the rattling
serves as a warning to would-be devourers, appears to me much
more probable, as it connects together various classes of facts.
If this snake had acquired its rattle and the habit of rattling,
for the sake of attracting prey, it does not seem probable that it
would have invariably used its instrument when angered or disturbed.
Prof. Shaler takes nearly the same view as I do of the manner
of development of the rattle; and I have always held this opinion
since observing the Trigonocephalus in South America.

[28] From the accounts lately collected, and given in the `Journal
of the Linnean Society,' by Airs. Barber, on the habits of the snakes
of South Africa; and from the accounts published by several writers,
for instance by Lawson, of the rattle-snake in North America,--it does
not seem improbable that the terrific appearance of snakes and the sounds
produced by them, may likewise serve in procuring prey, by paralysing,
or as it is sometimes called fascinating, the smaller animals.
no need to excite additional terror. But this is far from being the case,
for they are largely preyed on in all quarters of the world by many animals.
It is well known that pigs are employed in the United States
to clear districts infested with rattle-snakes, which they do most
effectually.[29] In England the hedgehog attacks and devours the viper.
In India, as I hear from Dr. Jerdon, several kinds of hawks, and at least
one mammal, the Herpestes, kill cobras and other venomous species;[30]
and so it is in South Africa. Therefore it is by no means improbable
that any sounds or signs by which the venomous species could instantly
make themselves recognized as dangerous, would be of more service to them
than to the innocuous species which would not be able, if attacked,
to inflict any real injury.

Having said thus much about snakes, I am tempted to add a few remarks on
the means by which the rattle of the rattle-snake was probably developed.
Various animals, including some lizards, either curl or vibrate their
tails when excited. This is the case with many kinds of snakes.[31]
In the Zoological Gardens, an innocuous species, the _Coronella Sayi_,
vibrates its tail so rapidly that it becomes almost invisible.
The Trigonocephalus, before alluded to, has the same habit;
and the extremity of its tail is a little enlarged, or ends in a bead.
In the Lachesis, which is so closely allied to the rattle-snake
that it was placed by Linnaeus in the same genus, the tail ends
in a single, large, lancet-shaped point or scale. With some snakes
the skin, as Professor Shaler remarks, "is more imperfectly detached
from the region about the tail than at other parts of the body."
Now if we suppose that the end of the tail of some ancient American
species was enlarged, and was covered by a single large scale,
this could hardly have been cast off at the successive moults.
In this case it would have been permanently retained, and at each period
of growth, as the snake grew larger, a new scale, larger than the last,
would have been formed above it, and would likewise have been retained.
The foundation for the development of a rattle would thus have
been laid; and it would have been habitually used, if the species,
like so many others, vibrated its tail whenever it was irritated.
That the rattle has since been specially developed to serve as an
efficient sound-producing instrument, there can hardly be a doubt;
for even the vertebrae included within the extremity of the tail have
been altered in shape and cohere. But there is no greater improbability
in various structures, such as the rattle of the rattle-snake,--
the lateral scales of the Echis,--the neck with the included ribs
of the Cobra,--and the whole body of the puff-adder,--having been
modified for the sake of warning and frightening away their enemies,
than in a bird, namely, the wonderful Secretary-hawk (_Gypogeranus_) having
had its whole frame modified for the sake of killing snakes with impunity.
It is highly probable, judging from what we have before seen,
that this bird would ruffle its feathers whenever it attacked a snake;
and it is certain that the Herpestes, when it eagerly rushes to attack
a snake, erects the hair all over its body, and especially that on its
tail.[32] We have also seen that some porcupines, when angered or alarmed
at the sight of a snake, rapidly vibrate their tails, thus producing
a peculiar sound by the striking together of the hollow quills.
So that here both the attackers and the attacked endeavour to make
themselves as dreadful as possible to each other; and both possess
for this purpose specialised means, which, oddly enough, are nearly
the same in some of these cases. Finally we can see that if,
on the one hand, those individual snakes, which were best able
to frighten away their enemies, escaped best from being devoured;
and if, on the other hand, those individuals of the attacking
enemy survived in larger numbers which were the best fitted
for the dangerous task of killing and devouring venomous snakes;--
then in the one case as in the other, beneficial variations,
supposing the characters in question to vary, would commonly have been
preserved through the survival of the fittest.


[29] See the account by Dr. R. Brown, in Proc. Zool. Soc. 1871, p. 39.
He says that as soon as a pig sees a snake it rushes upon it; and a snake
makes off immediately on the appearance of a pig.

[30] Dr. Gunther remarks (`Reptiles of British India,' p. 340) on the
destruction of cobras by the ichneumon or herpestes, and whilst the cobras
are young by the jungle-fowl. It is well known that the peacock also
eagerly kills snakes.

[31] Prof. Cope enumerates a number of kinds in his `Method of Creation
of Organic Types,' read before the American Phil. Soc., December 15th,
1871, p. 20. Prof. Cope takes the same view as I do of the use
of the gestures and sounds made by snakes. I briefly alluded to this
subject in the last edition of my `Origin of Species.' Since the passages
in the text above have been printed, I have been pleased to find that
Mr. Henderson (`The American Naturalist,' May, 1872, p. 260) also takes
a similar view of the use of the rattle, namely "in preventing an attack
from being made."

_The Drawing back and pressure of the Ears to the Head_.--The ears
through their movements are highly expressive in many animals;
but in some, such as man, the higher apes, and many ruminants,
they fail in this respect. A slight difference in position serves
to express in the plainest manner a different state of mind,
as we may daily see in the dog; but we are here concerned only with
the ears being drawn closely backwards and pressed to the head.
A savage frame of mind is thus shown, but only in the case of those
animals which fight with their teeth; and the care which they
take to prevent their ears being seized by their antagonists,
accounts for this position. Consequently, through habit
and association, whenever they feel slightly savage, or pretend
in their play to be savage, their ears are drawn back.
That this is the true explanation may be inferred from the relation
which exists in very many animals between their manner of fighting
and the retraction of their ears.


[32] Mr. des Voeux, in Proc. Zool. Soc. 1871, p. 3.

All the Carnivora fight with their canine teeth, and all, as far
as I have observed, draw their ears back when feeling savage.
This may be continually seen with dogs when fighting in earnest,
and with puppies fighting in play. The movement is different
from the falling down and slight drawing back of the ears,
when a dog feels pleased and is caressed by his master.
The retraction of the ears may likewise be seen in kittens
fighting together in their play, and in full-grown cats when
really savage, as before illustrated in fig. 9 (p. 58). Although
their ears are thus to a large extent protected, yet they often
get much torn in old male cats during their mutual battles.
The same movement is very striking in tigers, leopards,
&c., whilst growling over their food in menageries.
The lynx has remarkably long ears; and their retraction, when one
of these animals is approached in its cage, is very conspicuous,
and is eminently expressive of its savage disposition.
Even one of the Eared Seals, the _Otariapusilla_, which has
very small ears, draws them backwards, when it makes a savage
rush at the legs of its keeper.

When horses fight together they use their incisors for biting,
and their fore-legs for striking, much more than they do their hind-legs
for kicking backwards. This has been observed when stallions have broken
loose and have fought together, and may likewise be inferred from the kind
of wounds which they inflict on each other. Every one recognizes
the vicious appearance which the drawing back of the ears gives to a horse.
This movement is very different from that of listening to a sound behind.
If an ill-tempered horse in a stall is inclined to kick backwards, his ears
are retracted from habit, though he has no intention or power to bite.
But when a horse throws up both hind-legs in play, as when entering
an open field, or when just touched by the whip, he does not generally
depress his ears, for he does not then feel vicious. Guanacoes fight
savagely with their teeth; and they must do so frequently, for I found
the hides of several which I shot in Patagonia deeply scored. So do camels;
and both these animals, when savage, draw their ears closely backwards.
Guanacoes, as I have noticed, when not intending to bite, but merely to spit
their offensive saliva from a distance at an intruder, retract their ears.
Even the hippopotamus, when threatening with its widely-open enormous
mouth a comrade, draws back its small ears, just like a horse.

Now what a contrast is presented between the foregoing animals
and cattle, sheep, or goats, which never use their teeth in fighting,
and never draw back their ears when enraged! Although sheep and goats
appear such placid animals, the males often join in furious contests.
As deer form a closely related family, and as I did not know that they
ever fought with their teeth, I was much surprised at the account given
by Major Ross King of the Moose-deer in Canada. He says, when "two males
chance to meet, laying back their ears and gnashing their teeth together,
they rush at each other with appalling fury."[33] But Mr. Bartlett
informs me that some species of deer fight savagely with their teeth,
so that the drawing back of the ears by the moose accords with our rule.
Several kinds of kangaroos, kept in the Zoological Gardens, fight by
scratching with their fore-feet and by kicking with their hind-legs;
but they never bite each other, and the keepers have never seen
them draw back their ears when angered. Rabbits fight chiefly
by kicking and scratching, but they likewise bite each other;
and I have known one to bite off half the tail of its antagonist.
At the commencement of their battles they lay back their ears,
but afterwards, as they bound over and kick each other, they keep
their ears erect, or move them much about.


[33] `The Sportsman and Naturalist in Canada,' 1866, p. 53. p. 53.{sic}

Mr. Bartlett watched a wild boar quarrelling rather savagely with his sow;
and both had their mouths open and their ears drawn backwards.
But this does not appear to be a common action with domestic pigs
when quarrelling. Boars fight together by striking upwards with their tusks;
and Mr. Bartlett doubts whether they then draw back their ears.
Elephants, which in like manner fight with their tusks, do not retract
their ears, but, on the contrary, erect them when rushing at each other
or at an enemy.

The rhinoceroses in the Zoological Gardens fight with their nasal horns,
and have never been seen to attempt biting each other except in play;
and the keepers are convinced that they do not draw back their ears,
like horses and dogs, when feeling savage. The following statement,
therefore, by Sir S. Baker[34] is inexplicable, namely, that a rhinoceros,
which he shot in North Africa, "had no ears; they had been bitten
off close to the head by another of the same species while fighting;
and this mutilation is by no means uncommon."

Lastly, with respect to monkeys. Some kinds, which have moveable ears,
and which fight with their teeth--for instance the _Cereopithecus ruber_--
draw back their ears when irritated just like dogs; and they then have
a very spiteful appearance. Other kinds, as the _Inuus ecaudatus_,
apparently do not thus act. Again, other kinds--and this is a great anomaly
in comparison with most other animals--retract their ears, show their teeth,
and jabber, when they are pleased by being caressed. I observed this
in two or three species of Macacus, and in the _Cynopithecus niger_.
This expression, owing to our familiarity with dogs, would never be
recognized as one of joy or pleasure by those unacquainted with monkeys.


[34] `The Nile Tributaries of Abyssinia,' 1867, p. 443.


_Erection of the Ears_.--This movement requires hardly any notice.
All animals which have the power of freely moving their ears,
when they are startled, or when they closely observe any object,
direct their ears to the point towards which they are looking,
in order to hear any sound from this quarter. At the same time
they generally raise their heads, as all their organs of sense
are there situated, and some of the smaller animals rise on their
hind-legs. Even those kinds which squat on the ground or instantly
flee away to avoid danger, generally act momentarily in this manner,
in order to ascertain the source and nature of the danger.
The head being raised, with erected ears and eyes directed forwards,
gives an unmistakable expression of close attention to any animal.
CHAPTER V.

SPECIAL EXPRESSIONS OF ANIMALS.

The Dog, various expressive movements of--Cats--Horses--Ruminants--Monkeys,
their expression of joy and affection--Of pain--Anger--Astonishment
and Terror.


_The Dog_.--I have already described (figs. 5 and 1) the appearance
of a dog approaching another dog with hostile intentions,
namely, with erected ears, eyes intently directed forwards,
hair on the neck and back bristling, gait remarkably stiff,
with the tail upright and rigid. So familiar is this appearance
to us, that an angry man is sometimes said "to have his back up."
Of the above points, the stiff gait and upright tail alone
require further discussion. Sir C. Bell remarks[1] that,
when a tiger or wolf is struck by its keeper and is suddenly
roused to ferocity, every muscle is in tension, and the limbs
are in an attitude of strained exertion, prepared to spring.
This tension of the muscles and consequent stiff gait may be
accounted for on the principle of associated habit, for anger
has continually led to fierce struggles, and consequently
to all the muscles of the body having been violently exerted.
There is also reason to suspect that the muscular
system requires some short preparation, or some degree
of innervation, before being brought into strong action.
My own sensations lead me to this inference; but I cannot
discover that it is a conclusion admitted by physiologists.
Sir J. Paget, however, informs me that when muscles are suddenly
contracted with the greatest force, without any preparation,
they are liable to be ruptured, as when a man slips unexpectedly;
but that this rarely occurs when an action, however violent,
is deliberately performed.


[1] `The Anatomy of Expression,' 1844, p. 190.

With respect to the upright position of the tail, it seems to depend
(but whether this is really the case I know not) on the elevator muscles
being more powerful than the depressors, so that when all the muscles of
the hinder part of the body are in a state of tension, the tail is raised.
A dog in cheerful spirits, and trotting before his master with high,
elastic steps, generally carries his tail aloft, though it is not held
nearly so stiffly as when he is angered. A horse when first turned
out into an open field, may be seen to trot with long elastic strides,
the head and tail being held high aloft. Even cows when they frisk
about from pleasure, throw up their tails in a ridiculous fashion.
So it is with various animals in the Zoological Gardens. The position of
the tail, however, in certain cases, is determined by special circumstances;
thus as soon as a horse breaks into a gallop, at full speed, he always
lowers his tail, so that as little resistance as possible may be offered
to the air.

When a dog is on the point of springing on his antagonist,
be utters a savage growl; the ears are pressed closely backwards,
and the upper lip (fig. 14) is retracted out of the way of his teeth,
especially of his canines. These movements may be observed with dogs
and puppies in their play. But if a dog gets really savage in his play,
his expression immediately changes. This, however, is simply due
to the lips and ears being drawn back with much greater energy.
If a dog only snarls at another, the lip is generally retracted
on one side alone, namely towards his enemy.

The movements of a dog whilst exhibiting affection towards his
master were described (figs. 6 and 8) in our second chapter.
These consist in the head and whole body being lowered and thrown into
flexuous movements, with the tail extended and wagged from side to side.
The ears fall down and are drawn somewhat backwards, which causes
the eyelids to be elongated, and alters the


{illust. caption = FIG. 14.--Head of snarling Dog. From life,
by Mr. Wood. whole appearance of the face.
The lips hang loosely, and the hair remains smooth.
All these movements or gestures are explicable, as I believe,
from their standing in complete antithesis to those naturally
assumed by a savage dog under a directly opposite state of mind.
When a man merely speaks to, or just notices, his dog,we see
the last vestige of these movements in a slight wag of the tail,
without any other movement of the body, and without even the ears
being lowered. Dogs also exhibit their affection by desiring
to rub against their masters, and to be rubbed or patted by them.
Gratiolet explains the above gestures of affection in the
following manner: and the reader can judge whether the explanation
appears satisfactory. Speaking of animals in general,
including the dog, he says,[2] "C'est toujours la partie la plus
sensible de leurs corps qui recherche les caresses ou les donne.
Lorsque toute la longueur des flancs et du corps est sensible,
l'animal serpente et rampe sous les caresses; et ces ondulations
se propageant le long des muscles analogues des segments jusqu'aux
extremites de la colonne vertebrale, la queue se ploie et s'agite."
Further on, he adds, that dogs, when feeling affectionate,
lower their ears in order to exclude all sounds, so that their whole
attention may be concentrated on the caresses of their master!
Dogs have another and striking way of exhibiting their affection,
namely, by licking the hands or faces of their masters.
They sometimes lick other dogs, and then it is always their chops.
I have also seen dogs licking cats with whom they were friends.
This habit probably originated in the females carefully licking
their puppies--the dearest object of their love--for the sake
of cleansing them. They also often give their puppies, after a
short absence, a few cursory licks, apparently from affection.
Thus the habit will have become associated with the emotion of love,
however it may afterwards be aroused. It is now so firmly
inherited or innate, That it is transmitted equally to both sexes.
A female terrier of mine lately had her puppies destroyed,
and though at all times a very affectionate creature,
I was much struck with the manner in which she then tried
to satisfy her instinctive maternal love by expending it on me;
and her desire to lick my hands rose to an insatiable passion.
[1] `De la Physionomie,' 1865, pp. 187, 218.The same principle
probably explains why dogs, when feeling affectionate, like rubbing
against their masters and being rubbed or patted by them, for from
the nursing of their puppies, contact with a beloved object has
become firmly associated in their minds with the emotion of love.
The feeling of affection of a dog towards his master is combined
with a strong sense of submission, which is akin to fear.
Hence dogs not only lower their bodies and crouch a little
as they approach their masters, but sometimes throw themselves
on the ground with their bellies upwards. This is a movement
as completely opposite as is possible to any show of resistance.
I formerly possessed a large dog who was not at all afraid
to fight with other dogs; but a wolf-like shepherd-dog
in the neighbourhood, though not ferocious and not so
powerful as my dog, had a strange influence over him.
When they met on the road, my dog used to run to meet him,
with his tail partly tucked in between his legs and hair not erected;
and then be would throw himself on the ground, belly upwards.
By this action he seemed to say more plainly than by words,
"Behold, I am your slave." A pleasurable and excited state
of mind, associated with affection, is exhibited by some
dogs in a very peculiar manner, namely, by grinning.
This was noticed long ago by Somerville, who says,
And with a courtly grin, the fawning bound Salutes thee
cow'ring, his wide op'ning nose Upward he curls, and his large
sloe-back eyes Melt in soft blandishments, and humble joy.'
_The Chase_, book i.Sir W. Scott's famous Scotch greyhound,
Maida, had this habit, and it is common with terriers.
I have also seen it in a Spitz and in a sheep-dog. Mr. Riviere,
who has particularly attended to this expression, informs me
that it is rarely displayed in a perfect manner, but is quite
common in a lesser degree. The upper lip during the act
of grinning is retracted, as in snarling, so that the canines
are exposed, and the ears are drawn backwards; but the general
appearance of the animal clearly shows that anger is not felt.
Sir C. Bell[3] remarks "Dogs, in their expression of fondness,
have a slight eversion of the lips, and grin and sniff
amidst their gambols, in a way that resembles laughter."
Some persons speak of the grin as a smile, but if it had been
really a smile, we should see a similar, though more pronounced,
movement of the lips and ears, when dogs utter their bark of joy;
but this is not the case, although a bark of joy often follows a grin.
On the other hand, dogs, when playing with their comrades
or masters, almost always pretend to bite each other; and they
then retract, though not energetically, their lips and ears.
Hence I suspect that there is a tendency in some dogs,
whenever they feel lively pleasure combined with affection,
to act through habit and association on the same muscles,
as in playfully biting each other, or their masters' hands.
I have described, in the second chapter, the gait and
appearance of a dog when cheerful, and the marked antithesis
presented by the same animal when dejected and disappointed,
with his head, ears, body, tail, and chops drooping, and eyes dull.
Under the expectation of any great pleasure, dogs bound and jump
about in an extravagant manner, and bark for joy. The tendency
to bark under this state of mind is inherited, or runs in the breed:
greyhounds rarely bark, whilst the Spitz-dog barks so incessantly
on starting for a walk with his master that he becomes a nuisance.
[1] `The Anatomy of Expression,' 1844, p. 140.An agony of pain is
expressed by dogs in nearly the same way as by many other animals,
namely, by howling writhing, and contortions of the whole body.
Attention is shown by the head being raised, with the ears erected,
and eyes intently directed towards the object or quarter
under observation. If it be a sound and the source is not known,
the head is often turned obliquely from side to side
in a most significant manner, apparently in order to judge
with more exactness from what point the sound proceeds.
But I have seen a dog greatly surprised at a new noise, turning,
his head to one side through habit, though he clearly perceived
the source of the noise. Dogs, as formerly remarked, when their
attention is in any way aroused, whilst watching some object,
or attending to some sound, often lift up one paw (fig. 4)
and keep it doubled up, as if to make a slow and stealthy approach.
A dog under extreme terror will throw himself down, howl, and void
his excretions; but the hair, I believe, does not become erect
unless some anger is felt. I have seen a dog much terrified
at a band of musicians who were playing loudly outside the house,
with every muscle of his body trembling, with his heart
palpitating so quickly that the beats could hardly be counted,
and panting for breath with widely open mouth, in the same manner
as a terrified man does. Yet this dog had not exerted himself;
he had only wandered slowly and restlessly about the room,
and the day was cold. Even a very slight degree of fear is
invariably shown by the tail being tucked in between the legs.
This tucking in of the fail is accompanied by the ears being
drawn backwards; but they are not pressed closely to the head,as
in snarling, and they are not lowered, as when a dog is pleased
or affectionate. When two young dogs chase each other in play,
the one that runs away always keeps his tail tucked inwards.
So it is when a dog, in the highest spirits, careers like a mad
creature round and round his master in circles, or in figures
of eight. He then acts as if another dog were chasing him.
This curious kind of play, which must be familiar to every one
who has attended to dogs, is particularly apt to be excited,
after the animal has been a little startled or frightened,
as by his master suddenly jumping out on him in the dusk.
In this case, as well as when two young dogs are chasing each
other in play, it appears as if the one that runs away was afraid
of the other catching him by the tail; but as far as I can
find out, dogs very rarely catch each other in this manner.
I asked a gentleman, who had kept foxhounds all his life,
and be applied to other experienced sportsmen, whether they
had ever seen hounds thus seize a fox; but they never had.
It appears that when a dog is chased, or when in danger
of being struck behind, or of anything falling on him, in all
these cases he wishes to withdraw as quickly as possible his
whole hind-quarters, and that from some sympathy or connection
between the muscles, the tail is then drawn closely inwards.
A similarly connected movement between the hind- quarters and
the tail may be observed in the hyaena. Mr. Bartlett informs
me that when two of these animals fight together, they are
mutually conscious of the wonderful power of each other's jaws,
and are extremely cautious. They well know that if one of their
legs were seized, the bone would instantly be crushed into atoms;
hence they approach each other kneeling, with their legs turned
as much as possible inwards, and with their whole bodies bowed,
so as not to present any salient point; thetail at the same time
being closely tucked in between the legs. In this attitude
they approach each other sideways, or even partly backwards.
So again with deer, several of the species, when savage and fighting,
tuck in their tails. When one horse in a field tries to bite
the hind-quarters of another in play, or when a rough boy
strikes a donkey from behind, the hind-quarters and the tail
are drawn in, though it does not appear as if this were done
merely to save the tail from being injured. We have also seen
the reverse of these movements; for when an animal trots with
high elastic steps, the tail is almost always carried aloft.
As I have said, when a dog is chased and runs away, he keeps
his ears directed backwards but still open; and this is clearly
done for the sake of hearing the footsteps of his pursuer.
From habit the ears are often held in this same position,
and the tail tucked in, when the danger is obviously in front.
I have repeatedly noticed, with a timid terrier of mine,
that when she is afraid of some object in front, the nature
of which she perfectly knows and does not need to reconnoitre,
yet she will for a long time hold her ears and tail in this position,
looking the image of discomfort. Discomfort, without any fear,
is similarly expressed: thus, one day I went out of doors, just at
the time when this same dog knew that her dinner would be brought.
I did not call her, but she wished much to accompany me,
and at the same time she wished much for her dinner;
and there she stood, first looking one way and then
the other, with her tail tucked in and ears drawn back,
presenting an unmistakable appearance of perplexed discomfort.
Almost all the expressive movements now described, with the
exception of the grinning from joy, are innate or instinctive,
for they are common to all the individuals, young and old,
of all the breeds. Most of themare likewise common to the
aboriginal parents of the dog, namely the wolf and jackal;
and some of them to other species of the same group.
Tamed wolves and jackals, when caressed by their masters,
jump about for joy, wag their tails, lower their ears,
lick their master's hands, crouch down, and even throw themselves
on the ground belly upwards.[4] I have seen a rather fox-like
African jackal, from the Gaboon, depress its ears when caressed.
Wolves and jackals, when frightened, certainly tuck in their tails;
and a tamed jackal has been described as careering round
his master in circles and figures of eight, like a dog,
with his tail between his legs. It has been stated[5] that foxes,
however tame, never display any of the above expressive movements;
but this is not strictly accurate. Many years ago I observed
in the Zoological Gardens, and recorded the fact at the time,
that a very tame English fox, When caressed by the keeper,
wagged its tail, depressed its ears, and then threw itself
on the ground, belly upwards. The black fox of North America
likewise depressed its ears in a slight degree. But I believe
that foxes never lick the hands of their masters, and I have been
assured that when frightened they never tuck in their tails.
If the explanation which I have given of the expression of affection
in dogs be admitted, then it would appear that animals which have
never been domesticated--namely wolves, jackals, and even foxes--
have nevertheless ac- quired, through the principle of antithesis,
certain expressive gestures; for it is Dot probable that these animals,
confined in cages, should have learnt them by imitating dogs.
[4] Many particulars are given by Gueldenstadt in his account
of the jackal in Nov. Comm. Acad. Sc. Imp. Petrop.
1775, tom. xx. p. 449. See also another excellent account
of the manners of this animal and of its play, in `Land
and Water,' October, 1869. Lieut. Annesley, R. A., has also
communicated to me some particulars with respect to the jackal.
I have made many inquiries about wolves and jackals in
the Zoological Gardens, and have observed them for myself.
[5] `Land and Water,' November 6, 1869._Cats_.--I have already
described the actions of a cat

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