This same
phenomenon is observed in divers, when they have plunged into deep
water; that is, they pull themselves together and rise with a speed
proportional to their strength. Dolphins live together in pairs,
male and female. It is not known for what reason they run themselves
aground on dry land; at all events, it is said that they do so at
times, and for no obvious reason.
49
Just as with all animals a change of action follows a change
of circumstance, so also a change of character follows a change of
action, and often some portions of the physical frame undergo a
change, occurs in the case of birds. Hens, for instance, when they
have beaten the cock in a fight, will crow like the cock and endeavour
to tread him; the crest rises up on their head and the tail-feathers
on the rump, so that it becomes difficult to recognize that they are
hens; in some cases there is a growth of small spurs. On the death
of a hen a cock has been seen to undertake the maternal duties,
leading the chickens about and providing them with food, and so intent
upon these duties as to cease crowing and indulging his sexual
propensities.
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