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

Flightless birds, such as penguins and ostriches, evolve from ancestors capable of flight. When birds lose the ability to fly, their bodies adapt more rapidly than their feathers.

Despite being flightless, the ostriches of Africa have distant relations in Australia, New Zealand, and South America. All part of a group called the ratites, these birds share some common ...