Heavy is the Head
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Dinosaurs are ancestrally two-legged (bipedal,) but some large
herbivores evolved to move on four legs (quadrupedal) to support
greater weights. Dinosaurs in the clade marginocephalia, such as
these Psittacosaurus and Pachycephalosaurus are two-legged dinosaurs
related to the famous Triceratops. As these dinosaurs evolved
impressive frills and horns, their heavy headgear forced them into
a quadrupedal stance.
Tap Evolve to move on four legs!