M. Letorneau, in his discussion of animal marriage, says:

(1) "Almost universally, whether she be large or small, the female is less ardent than the male, and in the amorous tragi- comedy she plays from the beginning to the end a passive role. In the animal kingdom as well as mankind amazons are rare."
(2) "The female of mammals are always weaker than the male."
(3) "The female bird shows the natural reserve of her sex."