A serpent with a head on both ends of its body, Medusa's blood when she was beheaded created the Amphisbaena. It eats ants, it can join its heads together to form a loop so it can roll around, and its body will meld together again if cut in half.

Amphisbaena Appearance

Scaled serpent
Two heads, on one either side of its body
Feathered wings
Chicken's feet
Glowing red eyes