Cockatrice

"Cockatrices are born of eggs laid by roosters consorting with other roosters. The egg must be incubated for forty-four days by a toad, which is devoured by the little beast as soon as it hatches. A cockatrice hates everything that lives so fiercely that its glance turns the living to stone. Only a bold adventurer with a mirror can deflect its deadly gaze and defeat the cockatrice."

A cockatrice is a two-legged dragon-like creature with a rooster's head. The cockatrice was said to be generated from an egg laid by a cockerel and hatched by a serpent or toad. (Not to be confused with the Basilisk, born when the egg of a serpent or toad is hatched by a cockerel).

Abilities

The cockatrice has the reputed ability to kill people by either looking at them, breathing on them. The weasel is the only animal that is immune to the glance of a cockatrice. The creature can fly using the wings on its back. 

Historical basis

The cockatrice was first mentioned in the Bible in Isaiah chapters 11, 14 and 59.