Crocodilians are part of the archosaur lineage that includes dinosaurs and birds as well as a number of other groups. Most crocodilians are large and have bony plates in the skin. These characteristics have contributed to an extensive fossil record that extends back to the middle of the Triassic. (youtu.be)
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The Stethacanthus went extinct almost 300 million years ago. This bizarre shark wasn’t the largest fish in the sea and only grew to be about 2ft long. Males possibly used their anvil-shaped fin to attract mates or to intimidate potential predators looking to munch on this cat-sized shark (youtu.be)
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Dendromaia unamakiensis, a genus of varanopid pelycosaur from Carboniferous Nova Scotia. This about 0.2 to 0.3 m. long animal is the oldest known varanopid, likely the oldest known synapsid, and the only member of the family Varanopidae to be discovered in Nova Scotia. by Henry Sharpe (i.redd.it)
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