Birds across the Americas are getting smaller and longer-winged as the world warms, and the smallest-bodied species are changing the fastest.

Earth's biomass—the material that makes up all living organisms—is concentrated in organisms at either end of the size spectrum, research finds.

Like humans, chimps can combine words into phrases to communicate more meaning. What's more, other chimps can understand those combinations.

The loss of about 10,000 bits of genetic information over the course of our evolutionary history differentiates humans from chimpanzees.

"...we answer the question of where and when mammals diversified and evolved in relation to the K-Pg mass extinction."

The largest animals ever owe their size to feeding on the tiniest creatures in the sea, but their survival requires a minimum body size.

Most ants are hard workers, but some are total layabouts. A new study shows how social parasite ants become the leisure class of the colony.

As climate change warms the oceans at higher latitudes, it will impede the evolution of fish species, a new study suggests.

Matt Friedman wasn't looking for a brain when he scanned a 319 million-year-old fossilized fish skull, but that's just what he found.

“This is one of the first times Ice Age effects have been found in a tropical species," says José Avila-Cervantes.