Around 22% of Dark-mantled Sooties survive until adulthood (there are no figures for Light-mantled), both species return to the breeding colony after 7-10 years of fledging, and begin to breed a few years later.
mantled Sooties survive until adulthood (there are no figures for Light-mantled), both species return to the breeding colony after 7-10 years of fledging, and begin to breed a few years later. This was around 22% of Dark.