Cryolophosaurus lived on the jurassic period.Their skulls where very big.They can ripped any dinosaur like they can ripped food.On top of their heads are crest and it looks like a hammer.Their crests a made of bones.They don’t use their crests to hoot and their not hadrosaurs.Their crests runs just over their eyes where it rises up perpendicular to the skull and fans out.While other theropods like the monolophosaurus have crests.They usually run along the skull  instead across it.

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