What exactly are the "Kera'ayim"?
Rashi: They are two jumping legs (in addition to its four regular ones), which it uses to spring from one location to another. 1
Rashi, from Chulin 59a, 65b: To be Tahor, it must also have four wings, and they must cover the majority of its body, and it must be called Chagav. This is with or without a Gabachas (a bald head; some say, a hump), a tail, and a long head. However, we are not expert about what is called Chagav.
Why is the word "Lo" written with an 'Alef' but read with a 'Vav'?