Onon’s Epic Journey

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Onon returned after a 26,000km round trip that took in 27 border crossings and 16 countries. Photograph: Mongolia Cuckoo Project/Birding Beijing

Thanks to ornithologists like Dr Hewson, and to scientific instruments like the tracking device on Onon, we can see that Onon the cuckoo has made one of the longest migrations recorded by any land bird:

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Guardian graphic. Source: The Mongolia Cuckoo Project

Cloud cuckoo land? How one bird’s epic migration stunned scientists

When Onon the common cuckoo took off from Mongolia last June no one expected him to make a 26,000km round trip to southern Africa

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Onon moments before he was released on 8 June 2019. Photograph: Mongolia Cuckoo project/Birding Beijing

When Onon took off above the rolling hills of the Khurkh valley in Mongolia last June, researchers had no idea if they would see him alive again. Along with one oriental cuckoo and three other common cuckoos, each fitted with a tiny tracking device, he was about to embark on an epic journey to southern Africa.

Last month, he was the only bird to return safely with his tracker intact.

“It’s an amazingly long migration,” says Dr Chris Hewson, senior research ecologist at the British Trust for Ornithology, who said Onon’s 26,000km round trip was one of the longest journeys recorded by any land bird. Continue reading