The oldest bird of prey nest ever recorded, that was first used before the time of Jesus, has been discovered in Greenland.

The nesting site on a precarious cliff edge is still continually used by gyrfalcons, the world's largest species of falcon.

Three other nests, each over 1,000 years old, have also been found, one of which contains feathers from a bird that lived more than 600 years ago.

However it is feared climate change may soon drive the birds from these ancient nesting sites.