The mostly flightless, meat-eating dinosaur descendents were the size of dogs at their smallest, but the largest known examples reached nearly 10 feet in height.

Researchers including a Johns Hopkins University evolutionary biologist report they have analyzed a fossil of an extinct giant meat-eating bird—which they say could be the largest known member of its ...

“Terror birds” were giant, flightless, meat-eating creatures that roamed what is now South America for millions of years. As their threatening name suggests ...

Bird flu seems to be ramping up — the US announced its first human death this week, and the highly contagious virus has spread to all 50 states. With more than 130 million birds and nearly 1,000 dairy ...