
The earliest known extinct mammal has been identified using fossil tooth records.
Brasilodon quadrangularis was a small ‘shrew-like’ animal that measured around 20cm in length and had two sets of teeth.

The earliest known extinct mammal has been identified using fossil tooth records.
Brasilodon quadrangularis was a small ‘shrew-like’ animal that measured around 20cm in length and had two sets of teeth.