Alphadon (meaning "first tooth") was a genus of small, primitive mammal that was a member of the metatherians, a group of mammals that includes modern-day marsupials. Its fossils were first discovered and named by George Gaylord Simpson in 1929.[2]
A documentary show that’s based on Walking with Dinosaurs, When Dinosaurs Roamed America, Dinosaur Planet, Planet Dinosaur, Dinosaur Revolution and Prehistoric Planet.
