Add Yahoo as a preferred source to see more of our stories on Google. One Iberian harvester ant queen gave birth to two different species: an Iberian harvester male (left) and a Messor structor male. ...

Ancient footprints discovered in Kenya belong to two different species of human relatives who walked on the same ground at the same time, a study found. The prints are thought to belong to the species ...

More than a million years ago, on a hot savannah teeming with wildlife near the shore of what would someday become Lake Turkana in Kenya, two completely different species of hominins may have passed ...

Researchers have uncovered an unusual survival strategy in Iberian harvester ants that turns basic biology on its head: The queens can produce eggs that develop into two different ant species. A team ...