Again,

with regard to the breasts and the generative organs,
animals differ widely from one another and from man. For instance, the
breasts of some animals are situated in front, either in the chest
or near to it, and there are in such cases two breasts and two
teats, as is the case with man and the elephant, as previously stated.
For the elephant has two breasts in the region of the axillae; and the
female elephant has two breasts insignificant in size and in no way
proportionate to the bulk of the entire frame, in fact, so
insignificant as to be invisible in a sideways view;