A cockatrice is a kind of snake with a something like a chicken’s head, and 2 legs.

Cockatrice (see Snake).

A cockatrice is a mythical beast, essentially a two-legged dragon or serpent-like creature with a rooster’s head. Described by Laurence Breiner as “an ornament in the drama and poetry of the Elizabethans”, it was featured prominently in English thought and myth for centuries.

Source: [Anon-Animals]