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Which fossil animals did Thomas Henry Huxley study in Britain’s coal pits?

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Thomas Henry Huxley studied crocodile-shaped amphibians that were disinterred from Britain’s coal pits.1

While his work on these fossils was a significant part of his research, he also conducted extensive studies on crossopterygians—Devonian lobe-finned fishes considered the ancestors of amphibians—and famously demonstrated that birds descended from small carnivorous dinosaurs.1