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This dinosaurus foto contains triceratops.

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posted by GabsSaw
Pachycephalosaurs were among some of the last Dinosaur groups to appear. They lived 75-65 mya.


They are named after one of the best-known members of the group, Pachycephalosaurus.

Pachycephalosaurus means "thick-headed reptile," due to the domed and hugely thickened bone on the puncak, atas of its skull--like a cyclist's crash helmet.

About 15 feet long from nose to tail, Pachycephalosaurus lived in Montana, South Dakota, and Wyoming.

Stegoceras, which also lived in North America, was about 8 feet long, with a body the size of a goat.

Homalocephale was about 10 feet long and had a flatter skull. It lived in East Asia.

Pachycephalosaurs may have defended themselves oleh loweringtheir heads and charging at their enemies.

At breeding time, the males may have engaged in head-butting contests, as some domba and goats do today.