According to the English subtitles of the 1955 Japanese language film "Godzilla Raids Again", Anguirus (spelled "Angilas" in that film) was properly called an "Angilosaurus" (which in Japanese is pronounced roughly the same as "Ankylosaurus"), a dinosaur described as "one of the stronger dinosaurs that lived in the prehistoric era." He is described in a textbook by Polish world animal specialist Plateli Hondon as "one of the few creatures that had a thorough hatred for war-like predators," which explains Anguirus' eagerness to fight Godzilla. The dinosaur "Angilosaurus" lived (according to the film) from 150-70 million years ago, and was awakened by the same hydrogen bombs that awoke Godzilla. In the English-dubbed version of "Godzilla Raids Again" (released as "Gigantis the Fire Monster" in the US), the name of the dinosaur is pronounced ""ANG-will-o-Saw-rus," and given the sub-moniker "Killer of the Living." They ruled the Earth at one time, according to the film, then disappeared suddenly. From an unnamed textbook in the movie (the same book that in the Japanese-language version was written by Hondon), a scientist reads that these creatures (the angilosaurs) may return from hibernation due to radioactive fallout. Anguirus is said to have "brains in several parts of its body, including the head, abdomen, and the chest."