Flying is really hard work. Compared to walking, swimming, or running, flying is the form of movement that takes the most energy and requires the most calories. That means that birds have had to ...

Yuezhuornis, a 150-million-year-old Jurassic bird from China, had serrated teeth unlike any other bird and probably hunted on ...

No, not all bird bones are hollow. Birds have a mix of pneumatic (air-filled, "hollow") bones and marrow-filled bones, and the exact pattern varies significantly by species and even by individual bone ...

Spring in the Arctic brings forth a plethora of peeps and downy hatchlings as millions of birds gather to raise their young. The same was true 73 million years ago, according to a new article. The ...

Just about everyone knows that birds have hollow bones. The humerus, clavicle, sternum, pelvic girdle, and lumbar and sacral vertebrae are all hollow. And we were taught in elementary school that ...

Learn more about the earliest evidence of birds breeding and nesting in the Arctic, a behavior that millions of birds continue to this day. For a few months of the year, the Alaskan Arctic becomes ...