The next time you go wild swimming, whether in a lake, river or sea, you are probably sharing the water with one of your tiniest, yet closest relatives.

Life on Earth started in the oceans. Beginning around 390 million years ago, however, the ancestors of modern land animals rose out of the waters, trading their fins for limbs and gills for lungs.

A giraffe's long legs aren't just for height, they save energy by reducing how hard the heart works to pump blood upward ...

A microorganism whose evolutionary roots can be traced to the era of the first multicellular animals may provide a glimpse of how single-celled organisms made a critical evolutionary leap. In ...

The evolution of some of the earliest complex animals on our planet may have been spurred on by other, simpler early animals. These simple marine animals first evolved around 560 million years ago and ...

This article was originally featured on High Country News. Increasing frequent and intense fires are shaping how species change, according to a paper published last year in the journal Trends in ...

Surprising findings on the development of sea anemones suggest that a predatory lifestyle molded their evolution and had a significant impact on the origin of their nervous system. The researchers ...

Summary: A global study of vertebrates reveals that body temperature is the key driver behind brain size evolution. Warm-blooded species like mammals and birds can maintain the energy demands of ...

Alex is said to have mastered 100 words and even asked questions – something that’s almost unheard of in non-human animals.

Sphen and Magic, two male Gentoo penguins, recently made headlines when they ‘adopted’ an egg. Gentoos are closely related to Adélie penguins, the species Levick first observed in 1911. After the two ...