How did flightless birds travel around the world?

It's a question that has bedeviled ornithologists for years. And it might have just been solved.

Ostrich
(Image credit: (Cameron Spencer/Getty Images))

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 interests, like laying eggs, running fast, and not flying. But a logical question has bedeviled ornithologists for years: If these birds can't fly, how did they spread across the globe?

The standard explanation is that their common ancestor, also flightless, once roamed all over a southern supercontinent called Gondwana. As the continent split up millions and millions of years ago, populations of this bird were separated from each other on newly-formed landmasses. As their homes drifted into new positions, the isolated birds adapted and evolved in different ways, giving rise to the diversity of earth-bound birds we know today.

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