Ichthyosaurs Had Surprisingly Dense Ribs, New Study Finds
Long before whales ruled the oceans, dolphin-shaped marine reptiles called ichthyosaurs patrolled the same waters. New research from…
Permian Fossil is Earliest Evidence of Rib-Powered Breathing
Paleontologists have examined 289-million-year-old specimens of the early reptile Captorhinus aguti that preserve a covering of three-dimensional skin,…