The Mesozoic Era was dominated by a variety of reptiles and early forms of other groups:
- Dinosaurs: Including sauropods like Brachiosaurus and theropods like Tyrannosaurus rex.
- Pterosaurs: Flying reptiles with wingspans up to 30 feet.
- Marine reptiles: Mosasaurs, plesiosaurs, and ichthyosaurs.
- Mammals: Small, early forms such as multituberculates and primitive marsupials.
- Birds: Evolved from small feathered dinosaurs during this era.