Global warming has forced alpine chipmunks in Yosemite to higher ground, prompting a startling decline in the species' genetic diversity, according to a new study by researchers at the University of California, Berkeley.

If the climate is not quite right, birds will up and move rather than stick around and sweat it out, according to a new study led by biologists at the University of California, Berkeley.

Global warming is causing major shifts in the range of small mammals in Yosemite National Park.

The source of the noise which the Anna’s hummingbird emits has been a long-lived topic of debate among ornithologists. This particular species of hummingbird, which is native to the West Coast of the United States, makes a loud, brief chirp when he dives to impress female hummingbirds and entice them into mating.

ABSTRACT.- Latitudinal sexual segregation during the nonbreeding season, in which males tend to winter farther north than females, is known to occur in many temperate-zone bird species. This pattern, however, has rarely been reported in species wintering in tropical regions.