The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Expression of Emotion in Man and Animals by Charles Darwin:|
shrinking of the body from fear, which Mr. Weir has noticed, has been
in the quail and grass-parrakeet. The habit is intelligible
in these birds from their being accustomed, when in danger,
either to squat on the ground or to sit motionless on a branch,
so as to escape detection. Though, with birds, anger may be the chief
and commonest cause of the erection of the feathers, it is probable
that young cuckoos when looked at in the nest, and a hen with her
chickens when approached by a dog, feel at least some terror.
Mr. Tegetmeier informs me that with game-cocks, the erection of
the feathers on the head has long been recognized in the cock-pit
as a sign of cowardice.
Expression of Emotion in Man and Animals