Emma Hughes, a bird researcher at the University of Sheffield, has spent her career ... from the giant, flightless ostrich to the tiny, buzzing hummingbird. "Those are the sort of species that ...

They found that when birds evolve from a flying ancestor to a new flightless form, the birds' bodies, including the ratio of their wings and tails, change before the feathers do. Insights from ...

The most common reasons birds have evolved to be flightless are a lack of predators or the development of an alternative skill, such as swimming. Discover the stories behind five iconic flightless ...

The ostrich is the largest bird in the world. These flightless birds weigh between 220 and 350 pounds and stand about 7 to 9 feet tall, according to National Geographic. They’re also the fastest ...