Madagascar’s elephant birds — which weighed as much as three or four people and went extinct several hundred years ago — turn out to be the closest known relatives of New Zealand’s chicken-sized kiwi.

There would be at least four times as many flightless bird species on Earth today if it were not for human influences, finds a study led by UCL researchers. The study, published in Science Advances, ...

From extinction to rebirth, here’s a breakdown of how the takahē — one of Earth’s rarest birds — came back from an evolutionary death sentence.

WELLINGTON, New Zealand (AP) — Research linking New Zealand’s diminutive kiwi with a giant extinct bird from Africa is prompting scientists to rethink how flightless birds evolved. A report published ...

May 9 (UPI) --Evolution produced the same flightless bird species twice, with each occurrence separated by tens of thousands of years. The phenomena, called iterative evolution, helped bring the ...

Scientists have discovered a new species of flightless bird on a remote island in the Philippines, the conservation group BirdLife International said Tuesday. The rare find is dramatic, as flightless ...

A bird that had previously gone extinct came back to life thanks to a rare evolutionary process known as "iterative evolution." The white-throated rail bird can presently be found on the island of ...

ALACHUA, Fla. (AP) — A large, flightless bird native to Australia and New Guinea attacked and killed its owner when the man fell on his farm in Florida, authorities said Saturday. The Alachua County ...