| IUCN (International Union for Conservation of Nature): | Least Concern
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| Approximate size(adult): | Length about 39–46 cm; weight around 190–327 g. Large cuckoo with a long tail; males glossy bluish-black, and females brown with white streaks and spots.
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| Resident/ Migrate from: | Largely resident across the Indian subcontinent, Southeast Asia, and parts of China. Some northern populations show seasonal movements.
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| Migrate to: | In colder regions, migrates southward within Asia during winter. Tropical populations remain year-round residents.
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| Breeding season: | Typically March to August in India, coinciding with the breeding of host birds such as crows and mynas.
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| Breed in: | Brood parasite – lays eggs in the nests of other bird species (especially House Crows, Jungle Crows, and Common Mynas). Female mimics host behavior and color of eggs. Hosts incubate and raise the koel chick.
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| Habitat: | Found in woodlands, groves, farmlands, mangroves, and urban gardens. Adapts well to human-dominated landscapes where host species are common.
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| Diet: | Primarily frugivorous, feeding on figs, berries, and other soft fruits. Also consumes insects, caterpillars, and small vertebrates, especially during the breeding season.
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