An Amphisbaena (plural: amphisbaenae) is a snake with a head on each end of its body.
It is believed that the amphisbaena were born from the blood of Medusa's head while Perseus carried flying over the Libyan Desert. Cato's army encountered this creature along with other serpents on their march.
According to Pliny, wearing a live baby amphisbaena around your neck could assure you a safe pregnancy. Wearing its skin could make you attractive to potential partners.
An amphisbaena gets on an Amtrak in Washington, D.C. and stares at Apollo and Meg McCaffrey. When it is still on by the time they reach Philadelphia, the mortal god goes it investigate. The snake-like creature snatches his wrist before reciting some of the prophecy he heard before leaving Camp Jupiter. Then snaps out of a trance, stating it should have gotten off in Baltimore and that his wife was going to kill him. Right after Luguselwa saw and shot the amphisbaena.
- It can shoot poison from its mouth.
- Its equivalent in Egyptian mythology is the Tjesu heru.