Millions of years after animals first conquered land, some took an extraordinary evolutionary U-turn and returned to the water. Using machine learning and thousands of fossil measurements, Yale scientists have uncovered surprising clues about which prehistoric creatures truly became aquatic. Their findings suggest that Spinosaurus spent most of its life underwater, while some ancient marine reptiles previously thought to be fully aquatic actually spent considerable time on land.
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Researchers from Tel Aviv University found a tiny tail that was preserved in amber. The discovery provides, for the first time, direct evidence of the defense mechanism that characterized lizards that lived in the age of the dinosaurs. The researchers do not know what caused the lizard to shed it or whether it managed to escape
