Of blooded

and viviparous quadrupeds some have the foot cloven
into many parts, as is the case with the hands and feet of man (for
some animals, by the way, are many-toed, as the lion, the dog, and the
pard); others have feet cloven in twain, and instead of nails have
hooves, as the sheep, the goat, the deer, and the hippopotamus; others
are uncloven of foot, such for instance as the solid-hooved animals,
the horse and the mule. Swine are either cloven-footed or
uncloven-footed; for there are in Illyria and in Paeonia and elsewhere
solid-hooved swine. The cloven-footed animals have two clefts
behind; in the solid-hooved this part is continuous and undivided.