[i]A cockatrice is a mythical beast, essentially a two-legged dragon or serpent-like creature with a rooster's head.[/i] - "from the Wikipedia introduction":[https://en.wikipedia.org/w/index.php?title=Cockatrice&oldid=768652790]

It's sometimes also portrayed as a giant rooster with either a snake's tail or a snake's frontal part as a tail. It was believed that its gaze was fatal.
cockatrice