The hind feet are also furnished with five
toes; in their flexions and nails they resemble the front feet, and in
shape they resemble a fish's tail.
The movements of animals, quadruped and multiped, are crosswise,
or in diagonals, and their equilibrium in standing posture is
maintained crosswise; and it is always the limb on the right-hand side
that is the first to move. The lion, however, and the two species of
camels, both the Bactrian and the Arabian, progress by an amble; and
the action so called is when the animal never overpasses the right
with the left, but always follows close upon it.
Whatever parts men have in front, these parts quadrupeds have
below, in or on the belly; and whatever parts men have behind, these
parts quadrupeds have above on their backs. Most quadrupeds have a
tail; for even the seal has a tiny one resembling that of the stag.
Regarding the tails of the pithecoids we must give their distinctive
properties by and by animal
All viviparous quadrupeds are hair-coated, whereas man has only a
few short hairs excepting on the head, but, so far as the head is
concerned, he is hairier than any other animal. Further, of
hair-coated animals, the back is hairier than the belly, which
latter is either comparatively void of hair or smooth and void of hair
altogether.
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