U.S. Forest Service layoffs have upended surveys for spotted owls in Southern and Northern California, threatening data collection for the declining birds.

As temperatures warm, high-elevation conifer forests in Southern California have been moving upslope, shrinking the squirrels' habitat. Droughts threaten the squirrel's food supply of truffles, which ...

Gracefully gliding between trees at night in search of a feast of truffles, the San Bernardino flying squirrel is one of the most distinctive nocturnal residents of Southern California's ...