Dilophosaurus may have lived in packs, since three of the dilophosaurus fossils were found together in Arizona, USA. Dilophosaurus walked on two feet, the dilophosaurus was a really fast runner. The dilophosaurus would leave bird-like footprints behind and some fossilized just impressions of the claw-tips. The dilophosaurus had hollow bones and an S-shaped, curved neck.
Images from:
http://www.petrifiedcreatures.com/Dinosaurs.html
http://flickrhivemind.net/User/stevelewalready/Interesting
Info from:
http://www.enchantedlearning.com/subjects/dinosaurs/dinos/Dilophosaurus.shtml