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, ...

Bird species that have lost the ability to fly through evolution have become extinct more often than birds that have retained their ability to fly, according to new research from the University of ...

Ostriches, emus, rheas and other large, flightless birds are found on six landmasses separated by oceans, but how they reached such far-apart places without the ability to fly has remained an enduring ...