One of the most recognizable characteristics of birds is that they fly. Still, birds aren’t defined by an ability to fly, and there are a number of species worldwide that are ground-based.

Birds are often associated with flight, but not all of them take to the skies. Around 60 species — fewer than 1% of all bird ...

New Zealand's unique flightless nocturnal birds, like the kiwi and kakapo, showcase the country’s rich biodiversity.

The Maui Nui Moa-nalo (left) was the largest of the grazing flightless ducks that once roamed the forests of Kauai, Oahu and Maui Nui eating leaves and ferns. -- STANTON FINK illustration For ...

In a new study in the journal Evolution, researchers compared the feathers and bodies of different species of flightless birds and their closest relatives who can still fly. They were able to ...

Birds have feathers and a beak and lay hard-shelled eggs. Many birds are able to fly using their wings, but others such as ostriches are flightless and unable to fly. Some birds like penguins ...