Albertosaurus fossils show evidence of injuries, including a healed bite wound on one specimen's jaw, suggesting they fought each other, possibly over territory or mates.elaborate
Ceratosaurus had a horn on its nose, and two smaller horns above its eyes, but its most distinctive feature was a prominent bony frill or crest along its neck and back.
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Some sauropods, like *Diplodocus*, likely had air sacs in their necks and bodies, similar to modern birds, making them lighter and more efficient breathers.
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