In the case of wild animals no observation has
been possible; save in the case of animals that are occasionally
domesticated, such as the stag, and it, we know, chews the cud. All
animals that ruminate generally do so when lying down on the ground.
They carry on the process to the greatest extent in winter, and
stall-fed ruminants carry it on for about seven months in the year;
beasts that go in herds, as they get their food out of doors, ruminate
to a lesser degree and over a lesser period. Some, also, of the
animals that have teeth in both jaws ruminate; as, for instance, the
Pontic mice, and the fish which from the habit is by some called
'the Ruminant', (as well as other fish).
Long-limbed animals have loose faeces, and broad-chested animals
vomit with comparative facility, and these remarks are, in a general
way, applicable to quadrupeds, birds, and men.
49B
A considerable number of birds change according to season the
colour of their plumage and their note; as, for instance, the owsel
becomes yellow instead of black, and its note gets altered, for in
summer it has a musical note and in winter a discordant chatter.
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