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The Dinosaurs of Wyoming - Wyoming State Geological Survey ...

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THE THREE-HORNED DINOSAURS 109<br />

<strong>The</strong> fore-limb and foot are shorter than the hind foot, and<br />

the bones much heavier, marked with strongly developed,<br />

roughened projections for the attachment <strong>of</strong> heavy muscles.<br />

<strong>The</strong> causes <strong>of</strong> extinction <strong>of</strong> these remarkable reptiles are<br />

unknown, b'lt the most reasonable one is that <strong>of</strong> a changing<br />

climate, to which these highly specialized reptiles were unable<br />

to adapt themselves.

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