A two-headed turtle named Thelma and Louise was born at the San Antonio Zoo on June 18, 2013. A two-headed yellow-bellied slider lives at the Herpetarium in the Greensboro Science Center in North Carolina. A two-headed red-eared slider is on display at the Sideshow Museum in Uranus, Missouri. Choristoderes
In 2006, the UK Royal Society announced that it had discovered a two-headed fossil of Hyphalosaurus, the first recorded time that such a reptile has been found fossilized. Mythological occurrences
Mesopotamian mythology
Mušmaḫḫu, a seven headed serpent related to mythology of Ninurta, and Ningishzida. Sometimes related to Mušḫuššu. Humbaba, the guardian of the Cedar Forest, where the gods lived. A description from Georg Burckhardt translation of Gilgamesh says, "he had the paws of a lion and a body covered in thorny scales; his feet had the claws of a vulture, and on his head were the horns of a wild bull; his tail and phallus each ended in a snakes head." Greek mythology
Greek mythology contains a number of multi-headed creatures. Typhon, a vast grisly monster with many snake heads, is often described as having several offspring with Echidna, a creature with the lower body of a serpent but the upper body of a beautiful woman. Their offspring, by one source or another, account for many of the major monsters of Greek mythos, including:

Cerberus – a monstrous multi-headed dog that guards the gate to Hades. Ladon – a sometimes hundred-headed serpent-like dragon that guards the garden of the Hesperides and is overcome by Heracles.
There is some speculation that the inbreeding of snakes in captivity increases the chances of a two-headed birth. One or two beings? It is difficult to draw the line between what is considered "one animal with two heads" or "two animals that share a body". Abigail and Brittany Hensel, born in 1990, were given two distinct names at birth. They identify as two people, and are recognised as two people legally and socially. On the other hand, Syafitri, born 2006 in Indonesia, were given one name by their parents because they only had one heart. In early Germany, conjoined twins that could not be separated were legally considered one person. Millie and Christine McKoy were often referred to in the singular, including by themselves, with the name "Millie-Christine", as well as plural.In Peter Mogila’s 17-century Catechism, the following instructions are given for baptism of polycephalic infants: should there be distinct heads and distinct chests, this means there are separate people each of whom must be baptised normally; if the heads and chests are not completely distinct from each other, however, one person must be baptised normally but baptism of the other(s) should be preluded by the formula "if not already baptised".With other animals, polycephaly is usually described as "one animal with two heads". One of the heads, especially in three-headed animals, may be poorly developed and malformed, and not "participate" much.