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The female and male have different plumage; during the breeding season, the male is white with black wingtips and a black back, while the female has black wingtips and the black feathers on the back fringed with brown. During the winter, they both have broad orangey-brown fringes on the back feathers.
The jacky winter is instead a sexually monomorphic bird, which means that both the male and female are almost identical in appearance. [14] Rather than plumage playing a significant role in attracting the opposite sex, the jacky winter male uses song to attract a female during courtship. [15]
Its weight (which has been reported only for winter birds) ranges from 467 to 1,240 g (16.5 to 43.7 oz). Males average larger and heavier than females. [14] Like most ducks, it is sexually dimorphic. [16] The male has a chestnut-coloured head and neck, a black breast and tail, and a pale grey body, marked with fine vermiculations.
The face mask of the female is gray to black and is less defined than that of the male. Both sexes possess prominent raised crests and bright coral-colored beaks. The beak is cone-shaped and strong. [11] Young birds, both male and female, show coloring similar to the adult female until the fall, when they molt and grow adult feathers. [13]
Pine Warbler. The Pine Warbler is common in many pine forests along the eastern parts of the U.S. Both males and females have heads covered in bright yellow feathers.
The male and female bear similar plumage: an orange breast and face (more strongly coloured in the otherwise similar British subspecies E. r. melophilus), lined by a bluish grey on the sides of the neck and chest. The upperparts are brownish, or olive-tinged in British birds, and the belly whitish, while the legs and feet are brown.
Male and female plumage are identical at all stages of development, but adult males are often larger. [11] Juvenile and first-winter birds are mainly brown with darker streaks and have a dark bill and eyes. Second-winter birds have a whiter head and underparts with less streaking and the back is grey.
The indigo bunting is a small bird, measuring 11.5–13 cm (4.5–5.1 in) in length. It displays sexual dimorphism in its coloration; the male is vibrant blue in the summer, with brightly colored plumage during the breeding season to attract a mate. It is brown during the winter months, while the female is brown year-round.