210 million years ago · approximate date
The first mammals
Small nocturnal animals appear alongside the dinosaurs.
The earliest mammals were small and mostly nocturnal. Fur, milk and adaptable teeth were already in place, and would matter a great deal once the dinosaurs were gone.
- Period
- Triassic
- Earth's history already passed
- 95.3744 percent
- 4.54 kilometres
- 210 metres from the end
- One day
- 22:53:23
- One year
- December 15, 02:48
Source: Smithsonian National Museum of Natural History · Source to be verified