레위기 11:14의 주석

ואת האיה למינה, and the falcon after its kind. The falcon mentioned here includes many different kinds of birds all of which are sub-categories of the falcon family. Our sages in Chulin 63 state that at the time they were familiar with 120 different species of birds all of which belonged to that family. There may be even more than that number. The same applies to the many varieties of ravens, though the Torah mentions only the word "the raven" as if there were only one such bird.