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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.
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.
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]
In bi-parental care, the male provides food and the female is a caretaker. Both ensure the survival of the offspring. The female may care for her young by covering them to keep them warm, shielding them from the sun or from rain and guarding them from predation. The male may also feed the female, who in turn regurgitates the food to the chicks.
South Island robins are genetically monogamous, and extra-pair paternity is rare. [13] As they do typically remain monogamous, are non-migratory, and remain on their breeding territories year-round, a male and female in one territory will compete for food resources during non-breeding times.
The smallest of the red robins, the red-capped robin is 10.5–12.5 cm (4.1–4.9 in) long with a wingspan of 15–19.5 cm (5.9–7.7 in), and weighs around 7–9 g (0.25–0.31 oz). Males and females are of similar size. It has longer legs than the other robins of the genus Petroica. The male has a distinctive scarlet cap and breast.
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.
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]