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A 13-mile round trip hike was conducted by NPS paleontologists, park staff, and researchers from partner institutions to recover the fossil. (Photo/Petrified Forest National Park)

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Tetrapods are all four-limbed living land-animals; amphibians, reptiles, birds and mammals who descended from their last common ancestor around 365 million years ago.

By By Joe Giddens, Williams-Grand Canyon News November 5, 2021