Five cuckoos being tracked by satellite as they migrate south for the winter have all reached Africa, the British Trust for Ornithology (BTO) has revealed.
The BTO has tagged the cuckoos with tiny 5g tags and is following their progress as they head from breeding grounds in East Anglia to over-wintering areas in Africa.
The red-listed species has seen numbers halve in recent years, but experts have very little information on what happens to them once they leave the UK, with even their basic migration routes something of a mystery.
So the satellite tags are providing important information on their whereabouts and behaviour once they leave Europe, which will help conservation work to improve their fortunes.
According to the latest data from the tags, four birds – Clement, Kasper, Martin and Chris – have successfully crossed the Sahara, which is a major source of mortality for migrating birds, and are now in Burkina Faso, Nigeria and Chad.
The birds will be able to take advantage of the start of the rainy season in the region and the increase in insect food it will provide.
The four birds were all caught for tagging within 40 miles of each other in East Anglia but are now spread some 2,200 miles across sub-Saharan Africa.
The final bird, Lyster, left the UK in late July and is now in Morocco, around 12 miles from Casablanca, where he has been for several days. He is the first of the birds to make a stopover in North Africa before crossing the desert.
The birds’ progress can be followed at the BTO website – www.bto.org – where they have their own blogs.
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