Parasaurolophus was a horned dinosaur that walked on two legs but also walked on all fours. Neat trick, no?
A neat trick, especially if you weigh about 2.7 tons and stretch to about 31 feet long.
Wow-factor headgear such as the one it sports is a hallmark of its family in the dinosaur tree: Hadrosauridae.
This distinctive dino, whose name means "near crested lizard," lived in North America during the Late Cretaceous Period some 75 million years ago.
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There there has been much debate over the years among paleontologists about the purpose of Parasaurolophus' distinctive crest. The "horn" protruding back beyond its head was made of bone but hollow, with tubing connecting to each nostril. Scientists suspect it helped the animals distinguish males from females, a rather useful ability for mating. It may also have helped with their hearing and may even have aided the dino in the area of body temperature regulation.
There have been relatively few fossils unearthed of this rare dinosaur. Luckily, though, we have the magic of computer graphics to imagine what must have been an impressive-looking creature.