A cat with two faces, named Frank and Louie, sits on a mat in his home in Worcester, Mass. The animal is known as a Janus cat, named for the figure in Roman mythology with two faces on one head. The owner calls the face on the left Frank, while the face on the right she identifies as Louie. (AP Photo/Steven Senne)
Two-Headed Calf
Hakob Avetyan holds a two-headed calf in the Armenian village of Sotk, on January 28, 2011. The two-headed calf was born on January 25 in the Avetyans' cow house. Two-headed people and animals, though rare, have long been known to exist and documented. (Photo credit: KAREN MINASYAN/AFP/Getty Images)
Two-Headed Calf
Kirk Heldreth, left, pets his two-faced Holstein calf in Rural Retreat, Va. The calf, named "Star" which was born Dec. 27, 2006, breathes out of two noses and has two tongues, which move independently, according to Heldreth. There appears to be a single socket containing two eyes where the heads split. (AP Photo/Earl Neikirk)
Two-Headed Snake
Leonard Sonnenschein, president of the World Aquarium in St. Louis, holds We, a two-headed albino rat snake. (AP Photo/James A. Finley)
Two-Headed Tortoise
Credit: AP
Two Headed Turtle
A two-headed red slider turtle is displayed at Big Al's Aquarium Supercenter in East Norriton, Pa. (AP Photo/Matt Rourke)