Bacteria that live in the digestive tracts of animals may influence the adaptive trajectories of their hosts.

The physiological demands of that long neck get support from a gene involved in strengthening bones and blood vessels, researchers find after inserting the sequence in mice.

In yellow-green and purple versions of the reef-building Acropora tenuis, the genes that code for particular fluorescent and other colorful proteins become more active in the summer, protecting symbiotic algae from thermal stress and resisting bleaching.

The animals kill off around one-quarter of the neurons in their somatosensory cortex, perhaps to save energy, and the cells appear to return the following summer.

Unable to break through the water’s surface, tadpoles have a unique workaround for breathing air.

As global temperatures rise and winters shorten, caterpillars of the corn borer moth are emerging earlier in parts of the US thanks to changes in two genes, researchers find.

Geography plays a role in how the small mammals adapt to environmental changes.

The unusual cephalopod was spotted on a recent underwater research expedition.

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.

Researchers solve the mystery of 15-year-old mutant ferns with disrupted sex determination.

Anole lizards inhabiting the Caribbean islands display some of the key principles of evolution.