Cockatrice

[Isa. 11:8] And the sucking child shall play on the hole of the asp, and the weaned child shall put his hand on the cockatrice' den.
Cockatrice - A legendary creature about the size and shape of a dragon or wyvern, but in appearance resembling a giant rooster, with some lizard-like characteristics. The cockatrice is a mythological creature with the body of a dragon or serpent, and the head and legs of a rooster. According to myth, they are the product of a rooster egg (a rare thing indeed!) hatched by a serpent or toad. A magical creature, it can kill with a glance, and its breath is poisonous. The terms "cockatrice" and "basilisk" are usually used interchangeably.
Verse KJV 1885 RV NIV NASB NKJV RSV
Proverbs 23:32 adder (margin: cockatrice) adder (margin: basilisk) viper viper viper adder
Isaiah 11:8 cockatrice (margin: adders) basilisk (margin: adder) viper viper viper adder
Isaiah 14:29 cockatrice (margin: adder) basilisk (margin: adder) viper viper viper adder
Isaiah 59:5 cockatrice (margin: adders) basilisks (margin: adders) vipers adders vipers adders
Jeremiah 8:17 cockatrices basilisks (margin: serpents) vipers adders vipers adders
In the 15th century manuscript of a cockatrice being attacked by a weasel,
the only animal believed to be able to kill a cockatrice.