Camels copulate

with the female in
a sitting posture, and the male straddles over and covers her, not
with the hinder presentment on the female's part but like the other
quadrupeds mentioned above, and they pass the whole day long in the
operation; when thus engaged they retire to lonely spots, and none but
their keeper dare approach them. And, be it observed, the penis of the
camel is so sinewy that bow-strings are manufactured out of it.
Elephants, also, copulate in lonely places, and especially by
river-sides in their usual haunts; the female squats down, and
straddles with her legs, and the male mounts and covers her. The
seal covers like all opisthuretic animals, and in this species the
copulation extends over a lengthened time, as is the case with the dog
and bitch; and the penis in the male seal is exceptionally large.