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The American robin rejects cowbird eggs, so brood parasitism by the brown-headed cowbird is rare, and the parasite's chick does not often survive to fledging. [41] In a study of 105 juvenile robins, 77.1% were infected with endoparasites, Syngamus sp. being the most commonly encountered, in 57.1% of the birds. [42]
Both the male and female sing throughout the year, including during the winter, when they hold separate territories. During the winter, the robin's song is more plaintive than the summer version. [28] The female robin moves a short distance from the summer nesting territory to a nearby area that is more suitable for winter feeding.
A male flame robin either lands next to and moves a female off her perch, or flies in front of her. Courting males also run to and fro in front of a female, in a crouch with wings and head lowered, and hiding their breast feathers. In both displays, the male proceeds to chase the female.
Female nesting. In many species of birds, the male plumage is quite bright and flamboyant to attract the opposite sex in hope of finding a partner to mate with. The jacky winter is instead a sexually monomorphic bird, which means that both the male and female are almost identical in appearance. [14]
The male has a dark blackish-grey head, throat, back, wings and tail, a pink breast and belly fading to white on the lower abdomen, and a white forehead. The female is dark grey-brown above, with two buff-coloured wing-bars and pinkish-tinged underparts. The bill and feet are black, and the eyes are dark brown. [11] Pink Robin, Tasmania
Like many brightly coloured robins of the Petroicidae, it is sexually dimorphic. The male has a distinctive pink breast. Its upperparts are dark grey with white frons, and its tail black with white tips. The underparts and shoulder are white. The female is an undistinguished grey-brown. The robin has a small black bill and eyes.
The male and female pale-yellow robin are similar in plumage. Measuring 12–13.5 centimetres (4.7–5.3 in) and weighing 15–18 grams (0.53–0.63 oz), it is a bird of subdued appearance, with grey head and nape blending into olive-green upperparts, more brownish on the wings and tail.
The breeding season for golden bush robins in Pakistan is from May to June. The female birds tend to lay 3 or 4 eggs and their incubation period is 14 or 15 days. [3] The nests consist of compacted moss and grass that is lined with hair, wool, and feathers. [4] The lifespan of a golden bush robin is around 3.8 years. [3]
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