Fictional Creature Evolution

Story
It began millions of years ago.
 * 250 MYA: a group of theraspids evolve wings, feathers, and a beak; becoming the Gryphon
 * 220 MYA: a cynodont evolves a crocodile-like jaw with the odor of a skunk; becoming the Crocopup.
 * 200 MYA: a Dilophosaurus down-sizes and evolves venom, and a neck frill; becoming the Jurrassic Park Dilophosaurus
 * 150 MYA: an Aptosaurus evolves a Camarasaurus head; becoming Brontosaurus
 * More coming soon!