ESM Video S2. A male Oriental Magpie Robin entered the nest box and threw the nestling out of the nest by using his beak

ESM Video S1. A male Oriental Magpie Robin entered the nest box and started killing nestlings

Video S2. Temporary division of roles in a group of the false cleanerfish Aspidontus taeniatus raiding a nest of the three-spot dascyllus Dascyllus trimaculatus