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Shiny Cowbird Video Stock Footage

Like most other cowbirds, it is an obligate brood parasite, laying its eggs in the nests of many other bird species, such as (in Brazil) the rufous-collared sparrow and the masked water tyrant. The eggs are of two types, either whitish and unspotted, or pale blue or green with dark spots and blotches. The host’s eggs are sometimes removed, and if food is short their chicks may starve, but larger host species are less affected. The incubation period of 11–12 days is shorter than that of most hosts. Extermination of the shiny cowbird within the tiny range of the pale-headed brush finch has resulted in a population increase in this critically endangered species. The male shiny cowbird is all black with an iridescent purple-blue gloss. The smaller female is dark brown in plumage, paler on the underparts. She can be distinguished from the female brown-headed cowbird by her longer, finer bill, pale supercilium and stronger face pattern. There is an all-black plumage variation, and the northern subspecies M. b. cabanisii of Panama and northern Colombia is paler than the nominate M. b. bonariensis. Juveniles are like the female but more streaked below. There is some variation in size across the range, with the race of M. b. minimus from northern South America and the West Indies being the smallest at 31 to 40 g (1.1 to 1.4 oz) and 18 cm (7.1 in) in length and M. b. cabanisii being the largest at 55 to 65 g (1.9 to 2.3 oz) and 22 cm (8.7 in)...

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Animalia: Chordata: Passeriformes: Aves: Icteridae: Molothrus bonariensis

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