Cockatrice
From Ardrana
The cockatrice is an eerie, repulsive hybrid of lizard, cock, and bat. It is infamous for its ability to turn flesh to stone. The cockatrice is about the size of a large goose or turkey, and has the head and body of a cock, with two bat-like wings and the long tail of a lizard tipped with a few feathers. Its feathers are golden brown, its beak yellow, its tail green, and its wings gray. The cockatrice's wattles, comb, and eyes are bright red.
The cockatrice will fiercely attack anything, human or otherwise, which it deems a threat to itself or its lair. When attacking, the cockatrice will attempt to grapple with its foe, touching exposed flesh and turning it to stone. Flocks of cockatrices will do their utmost to overwhelm and confuse their opponents, and they will sometimes fly directly into their victims' faces.
Note: The cockatrice originally appeared in this form in the 2nd Edition Monstrous Manual for the AD&D game from TSR. Its use here is for the purposes of providing context for the campaign only.