According to Wikipedia, the amphisbaena plural: amphisbaenae; is a real creature. A worm lizard native to South America and parts of Africa, the Middle East, and Mediterranean Europe.
An Amphiptere is a hybrid from European heraldry, part snake and part bird or bat. Heraldry is a broad term, encompassing the design, display, and study of armory or armor, as well as related disciplines, such as vexillology (flag design,) together with the study of ceremony, rank, and pedigree. Throughout Europe, the amphiptere was widely feared, so all who displayed it on their coat of arms would be perceived as particularly fearsome in battle.
According to Wikipedia, Ammit also rendered Ammut or Ahemait, was a demoness and goddess in ancient Egyptian religion with a body that was part lion, hippopotamus, and crocodile—the three largest "man-eating" animals known to ancient Egyptians. A funerary deity, her titles included "Devourer of the Dead", "Eater of Hearts", and "Great of Death"
According to Wikipedia the Amemasu or the Ō-amemasu is a giant whale- or fish-like creature from Ainu folklore. Some of the largest amemasu are said to live in Lake Mashū and Lake Shikotsu in Hokkaidō, with smaller ones inhabiting lakes throughout northern areas of Honshu. The amemasu are known for capsizing boats, creating earthquakes, and causing other natural disasters.
According to Wikipedia an amarok, or amaroq, is a gigantic wolf, in Inuit mythology. It is said to stalk and devour any person foolish enough to hunt alone at night. Unlike wolves who hunt in packs, amaroks hunt alone.