Parasaurolophus was a large plant-eating dinosaur that lived in
North America during the late Cretaceous period,
about 76 to 74 Million
years ago.
Parasaurolophus was 33 feet (10 meters) long, 16 feet (4.9 meters) tall,
and weighed about 3 to 4 tons.
The crest on its head was up to 6 feet (1.8 meters) long and hollow,
and it is for this feature that the creature was named: its name means
"near crested lizard" and was chosen in reference to
Saurolophus.
Skulls with shorter crests have been found. At first, it was believed that
these were from a different species, but now scientists believe that
females had shorter crests than the males. Scientists generally believe
that the crests were used to help visually recognize other members of the same
species, as well as for making sounds.
An unique feature of Parasaurolophus, is a notch that appears in its
backbone. One possibility is that the crest may have fitted into this
notch when the animal was running through dense forest, using the crest could
as deflector to push away low hanging branches.
Parasaurolophus was a member of the Ornithischia ("bird-hipped") order of dinosaurs. What this means, is that although Parasaurolophus was not closely related to birds, it did have similarly shaped pelvic bones.
Parasaurolophus was a Hadrosaur (usually known as "duck-billed dinosaur") - a member of a group of related herbivorous (plant-eating) dinosaurs that were very successful in the Cretaceous period.
Parasaurolophus lived between about 76 million years ago and 74 million years ago, during the late Cretaceous period.
Parasaurolophus lived in North America.
Parasaurolophus was a herbivore (plant-eater).
Parasaurolophus was about 33 feet (10 meters) long, and 16 feet (4.9 meters) tall.
Parasaurolophus weighed about 3 or 4 tons.
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