Bird 'backpacks' help scientists discover the longest oversea migration

By fitting it with tiny geolocators, scientists have proven that the blackpoll warbler completes the longest known oversea journey for any land bird

A tiny North American songbird migrates 1,500 miles non-stop over the Atlantic, scientists have discovered, in the longest known oversea journey for any land bird.

The blackpoll warbler weighs only as much as a 2 coin and normally lives in forest environments, but once a year it embarks on a perilous three-day journey, scientists have found.