With most animals the genitals have the position above
assigned; but some animals discharge their urine backwards, as the
lynx, the lion, the camel, and the hare. Male animals differ from
one another, as has been said, in this particular, but all female
animals are retromingent: even the female elephant like other animals,
though she has the privy part below the thighs.
In the male organ itself there is a great diversity. For in some
cases the organ is composed of flesh and gristle, as in man; in such
cases, the fleshy part does not become inflated, but the gristly
part is subject to enlargement. In other cases, the organ is
composed of fibrous tissue, as with the camel and the deer; in other
cases it is bony, as with the fox, the wolf, the marten, and the
weasel; for this organ in the weasel has a bone.
When man has arrived at maturity, his upper part is smaller
than the lower one, but with all other blooded animals the reverse
holds good. By the 'upper' part we mean all extending from the head
down to the parts used for excretion of residuum, and by the 'lower'
part else. With animals that have feet the hind legs are to be rated
as the lower part in our comparison of magnitudes, and with animals
devoid of feet, the tail, and the like.
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