"And the sucking child shall play on the hole of the asp, and the weaned child shall put his hand on the cockatrice' den." -Isaiah 11:8
I found it interesting that the Cockatrice was mentioned in the King James version of the Bible. Other editions just refer to snakes or serpents. Could this be a reference to the Chicken-Headed Wyvren of mythology? More than likely it's a translation issue. Either way it would be a great idea for a Biblical/Sword & Sandal campaign!
From the Holmes Edition:
Move: 90 feet/turn,
180 feet flying
Hit dice :5
Armor class: 6
Treasure Type: D
Damage: 1-6 points
A smallish monster with the head, wings and legs of a cock and the tail of a serpent. The cockatrice can fly and it turns opponents to stone with it's touch if it scores a hit.
The monster is not intelligent.