Pachycephalosaurus wyomingensis was the largest of the pachycephalosaurids-"thick-headed dinosaurs"-which featured extremely thick skullcaps.
Pachycephalosaurus
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The late Maastrichtian rocks contain the largest members of several major clades: Tyrannosaurus, Ankylosaurus, Pachycephalosaurus, Triceratops and Torosaurus,[64] which suggests food was plentiful immediately prior to the extinction.
 See also: Dinosaur, Pterosaur, Worm, Bighorn, Lizard
  
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