Asked in PaleontologyMammalsDinosaurs
When did mammals first appear on earth?
Asked in Prehistoric Animals, Dinosaurs
During which period in the Mesozoic era did dinosaurs and the first mammals appear?
Asked in Dinosaurs
Did dinosaurs appear before mammals and how long before?
Asked in Earth Sciences, Mammals, Human Origins
When did humans and mammals appear on earth?
The first true mammals appeared on Earth around 200 million years ago, in the late Triassic period. However, these mammals would remain small and relatively insignificant due to the dominance of the dinosaurs. Only when they died out 65 million years ago did mammals grow and diversify to become the ones we see today. The first modern humans (Homo sapiens sapiens) evolved around 200,000 years ago.