Large-bodied, long-lived terrestrial birds, including raptors, typically exhibit sedentary behavior on islands, even when their mainland counterparts are migratory. Density-dependent variation in the age of sexual maturity has been described as a key factor in the long-term persistence of long-lived avian populations on islands. However, sedentary island populations may also benefit from increased survival rates due to the absence of migratory costs, particularly among juveniles. Consequently, these populations provide an ideal framework for studying the costs of migration. This study estimated age-specific survival in sedentary populations of Egyptian vultures and Red kites in Menorca, comparing them with other migratory and sedentary populations. The findings suggest that raptor species transitioning to insular sedentarism may benefit from enhanced pre-reproductive survival prospects compared to migratory mainland populations. This advantage, coupled with earlier sexual maturity, may significantly facilitate their long-term survival.