From the Rorschach inkblots to the famous 'duck–rabbit', scientists use an arsenal of so–called ambiguous images to help probe the human mind. Now, researchers have revealed four new pictures which ...

Two chimpanzees meeting with each other apparently have a discussion using hand gestures, one of the human-like characteristics of other mammals. (Getty Images) Of the 8.7 million species on Earth, ...

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 ...

Footprints made by Paranthropus boisei and Homo erectus Discovery raises questions about interspecies competition Tracks reveal differing foot anatomy and locomotion Nov 28 (Reuters) - About 1.5 ...

While someone who doesn’t know anything about animals might confuse them, reindeer and deer are two different animals. Though they belong to the same family, confusingly called “deer,” many different ...

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 ...

Nature is full of surprises, but few are as fascinating as hybrid animals, creatures born from crossing two different species ...