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, ...

The moa were a group of giant flightless birds that lived in New Zealand. They disappeared from Earth about 600 years ago, ...

Colossal Biosciences said it is working with famous "Lord of the Rings" director Sir Peter Jackson to bring the moa back to ...

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 ...

Birds are known for flying in the sky but not all birds can fly. Some birds spend their lives on the ground or in water and they are still strong and smart. These birds use their leg speed or swimming ...

A Tel Aviv University–led study of 160-million-year-old fossils shows that some feathered dinosaurs likely became flightless, challenging the idea that the evolution of flight followed a linear path ...

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 ...

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 ...