The discovery upends scientists' assumptions about the unusual mammals' origins and is a rare evolutionary event, researchers say. "A fair few mammals have evolved from living on land to living in the ...

In the natural world -- where predators pounce, prey flee, and group members feed and sleep in solidarity -- animal behavior is glorious in its variety. Now, new research suggests there may be an ...

The extinct Malleodectidae family of carnivorous marsupials has become a little bit bigger with the addition of a newly described species.

The primitive history of these unusual animals, he said, is “truly crucial” to our understanding of how mammals (including humans) came to be. “Monotremes are these living relics from a very ...

Echidnas may have evolved from a water-dwelling ancestor in an unusual evolutionary event, scientists have discovered. . | Credit: Kristian Bell/Getty Images Some of the strangest mammals on the ...