Here is a list of mythical creatures beginning with this letter and I am constantly gathering information from each continent and continually updating.
Amphisbaena (Greek)
he amphisbaena is a mythological, ant-eating serpent with a head at each end. The amphisbaena has a twin head, that is one at the tail end as well, as though it were not enough for poison to be poured out of one mouth. These early descriptions of the amphisbaena depict a venomous, dual-headed snakelike creature.
According to Greek mythology, the amphisbaena was spawned from the blood that dripped from the Gorgon Medusa's head as Perseus flew over the Libyan Desert with her head in his hand, after which Cato's army then encountered it along with other serpents on the march. Amphisbaena fed on the corpses left behind.