Brood parasitism occurs when one species of organism uses another host individual to raise their offspring. This would relive the biological parent from rearing their young, allowing them to have more time foraging and reproducing. Here we see an example of brood parasitism between a parent Pied Fantail (Rhipidura javanica) and a juvenile Rusty-breasted Cuckoo (Cacomantis sepulcralis). The parent cuckoo had laid its egg inside the fantail’s nest when its away resulting in the cuckoo egg hatching inside the fantail’s nest. The fantail would then raise the cuckoo up thinking that it is its own young.
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