CHICAGO — The Field Museum unveiled its acquisition Monday of a fossil showing the earliest known bird species — Archaeopteryx. Only a dozen other Archaeopteryx specimens have been found with ...

The Field Museum unveiled the new find on Monday. It's a small fossil of the first known bird. It's not only the best of its kind ever found, it's also the only one on exhibit at any major museum.

An ornithologist spent four decades tracking 40,000 bird deaths at a single building. His records paved the way to better ...