Illustrations by Stephanie Smith. 2. Thrinaxodon Puzzle: Life reconstruction of Thrinaxodon, an extinct mammal forerunner, show how the backbone was pieced together over evolutionary time.
Fossils of animals like Thrinaxodon, for example, have orbits near the sides of their heads. Finally, in our primate ancestors, the eyes moved to the front of the skull. This resulted in better ...
the burrows' relatively small size prompted Sidor to speculate that their owners might have been small lizard-like reptiles called Procolophonids or an early mammal relative called Thrinaxodon.