Johnny Wee‘s documented an adult Pied Fantail (Rhipidura javanica) feeding a much larger juvenile Rusty-breasted Cuckoo (Cacomantis sepulcralis) at Singapore’s Lorong Halus Wetland on 24th August 2012.
The Rusty-breasted Cuckoo, a brood parasite, is an uncommon resident. It parasitised the nests of a wide range of species LINK, most of which are small birds.
Encountering an adult foster parent feeding a much large chick can be a comical sight. But to the foster parents this this is no joke The adults need to work much harder to obtain food for a much larger hungry cuckoo chick or juvenile than to feed their own brood.