JOHN SIBBICK / SCIENCE PHOTO LIBRARY JOHN SIBBICK / SCIENCE PHOTO LIBRARY
Cacops and Casea tetrapods, illustration. Cacops (foreground) was an amphibian, an armoured predator. Casea (background) was a herbivorous synapsid, feeding on plants such as ferns. It was also adapted for an aquatic lifestyle. Both animals existed during the Early Permian, around 274 million years ago.
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