Cryolophosaurus was a predator from Antarctica. It lived during the early Jurassic during a time when the Antarctic is closer to the equator than to the bottom of the world. It lived in pairs and males would fight over females. Males crests depends on the health of the dinosaur. Sexually mature males have larger crests while younger males have smaller crests. The removal of the crest is a embarrassment to the dinosaur. The most common fossil found with Cryolophosaurus is a herbivore called Glacialisaurus.