When Heather Renner and her colleagues began noticing thousands of common murres washing up on Alaskan beaches nearly a decade ago, they knew something was terribly wrong. It would take years of ...

After nearly 250 years of informal recognition, the bald eagle has officially been designated as the national bird of the ...

Skeleton of the terror bird Titanis walleri at the Florida Museum of Natural History. (Amanda via Wikimedia Commons / Creative Commons Attribution 2.0 Generic) (CN ...

DESCRIPTION: The largest flying land birds in North America, California condors weigh about 20 pounds and have wingspans around 9.5 feet. They have bare, orange heads and necks, grayish-black feathers ...

It would take years of study to confirm they had witnessed the largest die-off of any bird species ever recorded in the modern era, according to new research published in the journal Science on ...