Cotylorhynchus was a massively built animal with a disproportionately small head and a huge barrel-shaped body.[3] It probably was one of the largest of all non-mammalian synapsids, if not the largest. It could grow to lengths of up to 6 m (20 ft) and could achieve weights of up to 2 metric tons (2.2 short tons). This large size was its best defence against the known predators of the time which were all much smaller than Cotylorhynchus, even the largest example of the fearsome Dimetrodon was still only half its size.
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