Amphisien

The Amphisien is sometimes considered an alternative name for the Cockatrice used in European Heraldry. They resemble a Cockatrice, a reptilian creature with a rooster head, but they have a second head at the end of their tails much like the Amphisbaena. A glance from this creature can kill someone or turn them to stone. They made an intimidating emblem on medieval shields.

Citations:

Bane, Theresa. Encyclopedia of Beasts and Monsters in Myth, Legend and Folklore. United States, McFarland, Incorporated, Publishers, 2016.

Elvin, Charles Norton. A Dictionary of Heraldry. United States, Genealogical.com, 2009.

Matthews, John, and Matthews, Caitlin. The Element Encyclopedia of Magical Creatures: The Ultimate A–Z of Fantastic Beings from Myth and Magic. United Kingdom, HarperCollins Publishers, 2010.

Rose, Carol. Giants Monsters and Dragons: An Encyclopedia Of Folklore Legend And Myth. United Kingdom, WW Norton, 2001.