I. Turgenev (1861) Vaders & Zonen "What do you want frogs for, mister?" one of the boys asked him. "I’ll tell you", answered Bazarov... "I shall cut the frog open to see what goes on inside him, and then, since you and I are much the same as frogs except that we walk about on our hind legs, I shall know what is going on inside us too." "And what do you want to know that for?" "So as not to make a mistake if you’re taken ill and I have to treat you." "Vasska, d’you hear that? The gentleman says you and me are the same as frogs" "Go on, into the water with you, my young philosophers!" said Bazarov.
Charles Darwin 1809 -1882 Origin of Species - 1859