This two-headed red slider turtle, now living at Big Al's Aquarium Supercenter in Pennsylvania, is particularly rare because the heads are on opposite sides of the shell. From The Metro:
Jay Jacobi, the shop's exotic reptile manager, said: "The two heads seem to have their own thoughts, operating independently.
"But sometimes they seem to put their two heads together and move in the same direction, feed together, walk together."
Link (via Fortean Times)