NEW YORK, Feb. 8 (UPI) -- A small, half-pound animal with a long furry tail, living on insects, was the common ancestor of almost all mammals, including humans, U.S. researchers say.
Scientists completing a 6-year study of the mammalian family tree have identified Protungulatum donnae, a previously little-regarded occupant of the fossil record, as the earliest ancestor of 5,400 living species of placental mammals, The New York Times reported Friday.