Gyaos

Gyaos are giant man-eating vampire bat monsters, and the primary antagonists of the Gamera series of films.

Appearance
Gyaos resemble gigantic creature bats that completely lack fur, and instead possess scaly skin. Gyaos have long tails tipped with a spike, arrow-shaped heads with pointed snouts, and mouths filled with sharp teeth. They often stand bipedally and upright.