Gyaos

The Gyaos are a species of pteranodon-like daikaiju and are the arch-nemesis of the heroic turtle daikaiju, Gamera, in the film series of the same name. Always hungry and casually destructive and murderous, it is said that their battle with Gamera is a recurring and even an eternal one. They are arguably more powerful than the rival Godzilla franchise's Rodan, for having ranged and melee weapons, but on average, Rodan seems to be tougher overall.

While their exact origin varies a bit, they are always an ancient menace, usually the bane of an ancient, lost super-civilization who are always put down in turn by their enemy, Gamera, but only after great suffering and death.

Film appearances :

Gamera Vs. Gyaos (1967) was the third film in the Showa series, and the first appearance of the Gyaos. Awakening due to construction in once-heavily-forested areas, a single Gyaos begins to destroy airplanes and flight and  devour Humans for their blood until Gamera shows up to oppose and battle it. A series of mixed-results battles occur, with Gamera wounded at first, and then Gyaos who endures the temporary loss of a talon rather than be destroyed by its bane, sunlight. Nagoya is attacked, and the JSDF air force is annihilated. Several plans by Human scientists fail, but Gamera is able to weaken Gyaos by keeping it in sunlight, after which he tosses it into an erupting volcano. Even in this early appearance, it is implied that this Gyaos was not the only one of its kind.

TBC...