A 2,500-year-old bird's nest has been discovered on a cliff in Greenland.
The nesting site is still continually used by gyrfalcons, the world's largest species of falcon, and is the oldest raptor nest ever recorded.
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.
BBC Earth News | 2,500-year-old bird's nest found
Photo by Eugenio Recuenco
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