A new study says more than 500 black bears have returned to parts of their historic range in the Great Basin of Nevada where the species disappeared about 80 years ago...

Hundreds of U.S. veterans who fought in Vietnam have reason to believe they may be dying from a silent bullet _ test results show some may have been infected by a slow-killing parasite in Southeast As...

Harbor seals, sea lions and other marine mammals have been rebounding in recent decades and they're devouring more of the chinook salmon prized by endangered Puget Sound orcas...

A Purdue University professor has received a $5 million grant to help develop hybrid grain seeds that will resist parasite weeds...

Fotis Kafatos, a Greek molecular biologist who had a distinguished academic career in both the United States and Europe, dies at age 77...

Fisheries biologists in Idaho say they think they know why a relatively new $13.5 million hatchery intended to save Snake River sockeye salmon from extinction is instead killing thousands of fish befo...

NASA has captured 20 years of seasonal changes in a striking new global map of the home planet...

Maine officials say a new species of wasp has been discovered in the state...

U.S. health authorities say they will crack down on doctors pushing stem cell therapies that pose the gravest risks to patients...

Pungent, ugly and often-toxic algae is spreading across U.S. waterways, even as the government spends vast sums of money to help farmers reduce fertilizer runoff that helps cause it...