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In page Spotted antbird:

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A smallish bird, measuring 11 cm (4.3 in) and weighing 16–19.5 g (0.56–0.69 oz). The male spotted antbird's plumage is a distinctive combination of a necklace of large black spots on a white chest, chestnut back, grey head, and black throat. The female is a duller version of the male, but also distinctive with large chest spots and two wide buffy wing-bars.[1]