Also known as: コカトリス
A cockatrice is a mythical beast, essentially a two-legged dragon or serpent-like creature with a rooster's head. - from the Wikipedia introduction
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.
In recent creative works, it is sometimes said that those who are stared at by it turn to stone.