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Eogyrinus was one of the largest Carboniferous tetrapods, and perhaps one of the largest of its family. It was 4.6 meters (15 feet) long. Eogyrinus was a powerful swimmer that moved quickly through the water by swishing its long tail from side to side. It may have been a predator, lying in wait in the shadows in much the same way as a crocodile does today. It's lightly built 560kg weight might allow it to do a death-roll, like a crocodile. Although probably better hunting in the water, Eogyrinus could probably make a grab for prey passing close by on land. Eogyrinus is known from Europe, where its fossils were found.
