For thousands of years, donkeys have been critical for propelling human civilizations forward. They've helped pull wheeled vehicles, carry travelers and move goods across the world. But where and when these animals first became intertwined with humans has been a mystery. Now, researchers have used genomes of over 200 donkeys to trace their domestication back to a single event around 7,000 years ago in East Africa -- about 3,000 years before humans tamed horses.

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