Adult birds are 18–22 cm (7.1–8.7 in) long, span 29–33 cm (11–13 in) across the wings and weigh 35–65 g (1.2–2.3 oz), with an average of 46 g (1.6 oz).At all ages and in both sexes, the beak is dusky horn-colored, and the feet and eyes are dark.
The adult male in breeding plumage has a black head, wings, back and tail, and a bright rose-red patch on its breast; the wings have two white patches and rose-red linings. Its underside and rump are white. Males in nonbreeding plumage have largely white underparts, supercilium and cheeks. The upperside feathers have brown fringes, most wing feathers white ones, giving a scaly appearance. The bases of the primary remiges are also white.
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