 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 that spend their winters in the South Atlantic off Brazil , and return to Rùm every summer to breed in underground 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 . 
