Dilophosaurus lived in the Early Jurassic Period, 200 million years ago. It grew to over 20 feet in length, which isn’t large when compared to later predatory dinosaurs, although it was one of the largest of its time. It had two distinctive head crests, which may have been used for display purposes.
History:
The first remains of Dilophosaurus were discovered by Jesse Williams, a Navajo, in the Navajo County of Arizona, in 1940. The dinosaur would later be described formally in 1954 by paleontologist Samuel P. Welles, though he believed it to be a species of Megalosaurus. Later, in 1964, Welles discovered new remains that showed Dilophosaurus’s distinctive head crests, and named it after them upon realizing this was not a Megalosaurus.
Unlike its appearance in movies and other pop culture, there is no fossil evidence that suggests Dilophosaurus sported a frill, or was able to spit venom.