Dinosaurs
The dinosaurs originated from diapside reptiles which survived the mass-extinction at the end of the Permian as swimming archosaurs. From those
emerged bipedal archosaurs, among others two groups of bipedal herbivores, the short-necked ancestors of the ornitischian dinosaurs, and
long-necked ancestors of the saurischian sauropods. Later emerged the short-necked meat-eaters, ancestors of the carnosaur dinosaurs. From a
lineage of small bipedal, tree-mounting bird-ancestors the various groups of bird-like, coelurosaurs branched off.
The dinosaurs disappeared as …
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…sea decreased which upset the
ecological balance of the sea too: The algae were food for other sea-organisms, which were food for fishes and other see-animals, which also decreased, why the
lope-finned fishes and the see-reptiles, ichthyosaurs, plesiosaurs, mesosaurs ect. consequently disappeared.
These factors, and surely many others, brought the world of the dinosaurs to an end, leaving a world covered with foliated forests, and the possibility for the small,
warm-blooded mammals to evolve.
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