the.com/amphisbaena

means A mythical serpent said to have a head at both ends, able to move in either direction; in modern zoology, the name was also given to a genus of legless, burrowing reptiles (worm lizards) whose blunt tails resemble a second head.

from From Greek amphisbaina, built from amphis 'both ways' and bainein 'to go' — literally 'goes both ways.' The ancients (Pliny and others repeated the tale) imagined a creature that needed no turning around because either end could lead the charge. Naturalists later borrowed the name for real burrowing reptiles whose rounded, head-like tails let them retreat backward through tunnels — a quiet nod to the old two-headed legend.