Scientists have grown human cells inside pig embryos, a very early step toward the goal of growing livers and other human organs in animals to transplant into people...

Some farmers and conservationists say the resurgence of the American bald eagle has come at a price...

Researchers tracking volunteers to see if wearable sensors that go beyond fitness make a difference in users' health...

Federal regulators have designated a bee species in the continental United States as endangered...

New research finds a small shorebird flies long distances in search of love...

US wildlife officials say it might be time for a toast now that a once-rare bat important to the pollination of the Mexican plants used to produce tequila is making a comeback...

A new study says a distinctive type of tree that thrives in soggy soil from Alaska to Northern California could become a casualty of climate warming over the next 50 years...

A new report finds water clarity in the Chesapeake Bay is the best it's been in decades, and native rockfish, oyster and blue crab populations are rebounding as the overall health of the nation's larg...

Researchers create vaccine using living malaria parasites stripped of genes that make people sick...

Researchers says the oldest member of the small population of endangered Puget Sound orcas has been missing for months and is now likely dead...