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Dinosauria

Zuniceratops

A smaller, earlier horned dinosaur that helps show the transition toward the larger, more elaborate ceratopsids. It did not yet have the full giant frill-and-horn look of Triceratops, but it sits close to that later line in the broader horned-dinosaur story. Lived from about 90 to 89 million years ago.

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Avialae: The Bird Line Diverges (Theropoda)

Early sample: Aurornis Although the exact early avialan boundary is famously messy, we do know birds evolved from theropos. In the “Great Divide” of dinosaur classification, birds are members of the Saurischia (“lizard-hipped”) branch, specifically the Theropods. These ornithischians, or “bird-hipped” dinosaurs, are dinosaurs like Triceratops and Stegosaurus. Evolution produced a similar hip structure here

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