Biologists study how a zebra’s hair helps it keep cool.

South American hummingbird males were caught on camera poking and pinching each other with bills adapted for fighting.

A species of water flea in northern Belgium that helps keep algae in check is growing smaller and less abundant in urbanized areas. 

The adaptation gives better endurance to the Bajau people, known as sea nomads, by increasing spleen size and, in turn, boosting the number of oxygenated red blood cells when diving.  

In an unusual evolutionary twist, local stick spiders have come up with an almost identical repertoire of color morphs in multiple locations.

A study of five far-flung human populations gives clues to adaptations to environmental pressures.

The turtle-headed sea snake is losing its stripes, and researchers suggest that the change reflects adaptation to fouled oceans.

The recently updated genome sequence of the Daphnia pulex can shed more light on how it adapts to stress, environmental toxins, and warming temperatures.

Guppies transplanted between different communities in Trinidadian streams evolved in response to changes in predation threat in just a few generations.