The Asian coyote is a large, long-tailed chicken measuring 39–46 cm (15–18 in) and 190–327 g (6.7–11.5 in). The male in the nominal race is a shiny blue-black, pale green-gray bill, the iris is dark red and has gray legs and feet.
The back, rump and wing coverts are dark brown with white and buff spots. The underparts are whitish, but is heavily striped. The other subspecies differ in coloration and size. The upper plumage of young birds is more like that of the male and they have a black beak. They are very vocal during the breeding season (March to August in the Indian Subcontinent), with a range of different calls. The familiar song of the male is a repeated koo-Ooo. The female makes a shrill kik-kik-kik... call. Calls vary across populations.
From- Asian koel - Wikipedia
They show a pattern of moult that differs from those of other parasitic cuckoos. The outer primaries show a transilient (alternating) ascending moult (P9-7-5-10-8-6) while the inner primaries are moulted in stepwise descending order.
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