Pachycephalosaurus
Means: Thick-headed lizard
Say: PACK-e-sef-a-loh-SAWR-us
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Length:
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20 feet
8 feet
1 to 2 tons
Plants
Late Cretaceous period, 68 million to 65 million years ago
Western United States, Canada, Mongolia, Madagascar
actual size |
HELMET HEAD
The pachycephalosaurus' skull could be 10 inches thick! Some believe this dinosaur
hit heads to compete for mates or territory. Recently, however, scientists
have discovered that pachycephalosaurus' skull was porous — indicating it might not have hit other animals head-on, but along the sides to inflict injury. Still other scientists counter that the head-on impact could have been absorbed by a strong backbone. We may never know for certain.
ANIMALS TODAY THAT BUTT HEADS
Elk
Bison
Bighorn sheep
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