This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Cockatrice (Medieval Bestiaries)
A cockatrice is a mythical beast, essentially a two-legged dragon, wyvern, 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.
The cockatrice, in the legends of Hellenistic and Roman times, a small serpent, possibly the Egyptian cobra, known as a basilikos (“kinglet”) and credited with powers of destroying all animal and vegetable life by its mere look or breath. Only the weasel, which secreted a venom deadly to the cockatrice, was safe from its powers.