What land animals existed during the time of the Western Internal Seaway?
- nineteenthlyLv 73 weeks ago
Various dinosaurs, including avian dinosaurs, and early placental mammals.
- ANDRE LLv 74 weeks ago
None which have anything to do with Astronomy & Space.
Go ask in Anthropology.
- RobertLv 64 weeks ago
Dragons, unicorns, and sea trolls.
- KennyBLv 74 weeks ago
The Western Interior Seaway formed 100 million years ago in the mid-Cretaceous and covered parts of North America.
On land, mammals were generally small sized, but a relevant component of the fauna, with cimolodont multituberculates outnumbering dinosaurs in some sites. A variety of non-marsupial metatherians and non-placental eutherians had already begun to diversify greatly, ranging as carnivores, aquatic foragers and herbivores.
The apex predators were archosaurian reptiles, especially dinosaurs, which were at their most diverse stage. Pterosaurs were common, but as the Cretaceous proceeded they declined for poorly understood reasons (once thought to be due to competition with early birds).