Most mammals of this vintage are known only by their teeth.
Fossil find hints at life of one of our earliest mammalian forebears.
A mouse-sized fossil from 125 million years ago is the earliest known member of the mammal group that includes humans, say researchers.
The animal is a primitive example of today’s dominant mammals. "It’s at the very root of this diverse and incredibly important group," says palaeontologist Zhe-Xi Luo of the Carnegie Museum of Natural History in Pittsburgh1.
JOHN WHITFIELD | © Nature News Service
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