An artists rendering of a placental ancestor. Researchers say the small, insect-eating animal is the most likely common ancestor of the species on the most abundant and diverse branch of the mammalian family tree.
Credit: Carl Buell
Humankind's common ancestor with other mammals may have been a roughly rat-size animal that weighed no more than a half a pound, had a long furry tail and lived on insects.
From The New York Times
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