Dilophosaurus.
This was a fairly primitive Jurassic theropod, being far more lithe and delicate than many of its counterparts at the time. It would have fed on much smaller prey as a result. The discovery of three Dilophosaurus skeletons together suggests that they may have been pack or group animals, working together to find food. The weak nature of its upper jaw means that it was likely a scavenger more than a hunter, as it wouldn’t have been able to easily tackle large prey.

Its most obvious feature is the pair of nearly semi-circular bony crests on its head. These would almost certainly been used for display.

"One Dilophosaurus wetherilli specimen shows potential damage “due to injury or crushing” to a vertebra, and a potential abscess on a humerus. A Dilophosaurus wetherilli is also known with an unusually small left humerus compared to a very robust right arm, a possible example of “fluctuating asymmetry”. Fluctuating asymmetry results from developmental disturbances and is more common in populations under stress and can therefore be informative about the quality of conditions a dinosaur lived under.” -Wikipedia.

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