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• Featured Scientist
Studying Early Tetrapods
During the Permian Period, tetrapods—four-limbed vertebrates—were becoming more diverse. However, early Permian tetrapods were still quite primitive: they had features in common with tetrapods from previous periods. For example, they likely laid their eggs in the water, making them similar to the frogs and salamanders you probably know as “amphibians.”
Though we have no fossil evidence of how most primitive tetrapods reproduced, there are many things we can begin to understand by looking closely at their skeletons. Scientists study the fossils of early primitive tetrapods for clues to their different diets, habitats, and lifestyles.
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 Dr. John Bolt
Meet a Dr. John Bolt, a Field Museum scientist who can trace the ancestry of today’s frogs and salamanders back to these fossil tetrapods.
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Continue to the Mesozoic Era. >>
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