BIRDS of prey are known for their habit of using the same nest site, such as a cliff ledge, year after year. Now it seems that can carry on this tradition for millennia.
By radiocarbon dating guano samples at 13 gyrfalcon nest sites in Arctic regions of west Greenland, of the Edward Grey Institute of Field Ornithology in Oxford, UK, and colleagues showed that some sites have been occupied for at least 2500 years. The oldest sites tended to be those at higher elevations, probably because these were the first to become usable as the Pleistocene…
