Rùm is also noted for its bird life. The population of 70,000 Manx shearwaters is one of the largest breeding colonies in the world. These migrating birds spend their winters in the South Atlantic off Brazil, and return to Rùm every summer to breed in burrows high in the Cuillin Hills. White-tailed sea eagles were exterminated on the island by 1912 and later became extinct in Scotland. A programme of reintroduction began in 1975, and within ten years 82 young sea eagles from Norway had been released. There is now a successful breeding population in the wild.