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About Dilophosaurus:
Among the earliest theropod dinosaurs, Dilophosaurus was also one the least threatening (unless, of course, you happened to be a small, quivering herbivore of the Jurassic period). This carnivore was slightly built, with a much more slender frame than the thick, relatively plodding body plans of later, larger theropods like Allosaurus. Presumably, it made up in speed what it lacked in sheer bulk. (See 10 Facts About Dilophosaurus, a gallery of Dilophosaurus pictures, and an article explaining how Dilophosaurus was discovered.)
As for the distinctive crests over Dilophosaurus' eyes, paleontologists believe these were sexually selected--that is, males with these structures had a better chance of mating with females. Although sexual selection may explain similar features on other dinosaurs, when it comes to Dilophosaurus, this theory is on much better ground--since only some fossils (presumably the males) have been found to bear these crests. (By the way, despite what you saw in Jurassic Park, there's absolutely no reason to think Dilophosaurus spit poison at its enemies before zooming in for the kill.)
