Some 144 bird species had not been seen in at least a decade, but a project by conservation organizations proposes they all may still be hidden somewhere in the wild.

Out of all the records, 144 species, 1.2% of all known bird species, qualified as lost. Since this study was initiated, other lost birds have been rediscovered, ...

It is a book purely for reference, consisting of a systematic list of all known birds, with the authorities for the names used and the distribution of each form.

The harpy eagle is by far one of the strongest birds on Earth. This large bird of prey lives in tropical forests throughout ...

The four most numerous bird species in the world as listed by the National Academy of Sciences (NAS) — house sparrow, barn swallow, European starling and ring-billed gull — are found in ...

The official naming organization for birds in the U. S. is making a bold move, after concerns were raised about birds being named after people with questionable histories.

It’s also likely that the ancestor of all modern birds had iridescent feathers. The findings are detailed in a study published July 26 in the journal Nature Ecology & Evolution.

More than 500 species of birds have been spotted in Arizona. An expert birder shares his top 10 list, including a couple you'll likely only see here.