It happened that the lower jaw [of an animal] protruded beyond its upper jaw; Rabban Shimon ben Gamliel sent to the Sages, and they said: It is a blemish. [If] a kid’s ear was doubled —- the Sages said: In the instance that it is one body, it is a blemish; but if it is not one body, it is not a blemish. R’ Chanania ben Gamliel says: A kid’s tail that resembles that of a pig, or [a tail] that does not have three vertebrae, is a blemish.