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Fossilized Edmontosaurus Reveals First Hooves, Shapes Evolution

10/23/2025

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Summary

Story summary

Wyoming scientists have discovered two fossilized Edmontosaurus dinosaurs, revealing detailed external anatomy including hooves—the first documented for any dinosaur.
The fossils date to 66 million years ago and preserve soft tissue, with the adult about 40 feet long and the juvenile half that size.
Researchers propose death occurred during a drought followed by a flash flood, shaping understanding of dinosaur evolution and ecological roles alongside Tyrannosaurus.

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Story summary

Wyoming scientists have discovered two fossilized Edmontosaurus dinosaurs, revealing detailed external anatomy including hooves—the first documented for any dinosaur.
The fossils date to 66 million years ago and preserve soft tissue, with the adult about 40 feet long and the juvenile half that size.
Researchers propose death occurred during a drought followed by a flash flood, shaping understanding of dinosaur evolution and ecological roles alongside Tyrannosaurus.