Irritator challengeri, named for the feelings the paleontologists who found the skull felt after buying it off of fossil dealers who had heavily damaged and altered it, was a genus of spinosaurid theropod dinosaur that lived in what is now Brazil during the Early Cretaceous, around 110 million years ago. It was rather small for a spinosaurid, being only about 20 to 25 feet long and weighing around a ton. Like others of its family, it had conical, crocodile-esque teeth, enlarged claws on the first fingers of its hands, a sagittal crest on the top of its head, and a short sail running down its back. Irritator was likely semiaquatic like other spinosaurids and probably had a generalist diet, hunting and eating anything it could catch from small fish to medium-sized dinosaurs.
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