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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.
They build open-cup nests in tree-forks or inside tree cavities. Incubation lasts 18 days, and chicks leave the nest after 21 days. Five to 25 days after fledglings leave the nest, the pair may breed again. Modal clutch size is two eggs, with the expected inverse correlation between dimensions and number of eggs. [16]
Egg incubation is the process by which an egg, of oviparous (egg-laying) animals, develops an embryo within the egg, after the egg's formation and ovipositional release. Egg incubation is done under favorable environmental conditions, possibly by brooding and hatching the egg.
The white-starred robin is a small robin, 15 to 16 cm (5.9–6.3 in) in length and weighing between 18 and 25 g (0.63–0.88 oz), with the females being slightly smaller than the males. The plumage of the nominate race is slate-grey on the head, with a white spot in front of each eye and another small one on the throat.
The larger American robin (Turdus migratorius) is a much larger bird named from its similar colouration to the European robin, but the two birds are not closely related, with the American robin instead belonging to the same genus as the common blackbird (T. merula), a species which occupies much of the same range as the European robin. The ...
The females will mate with the males in her territory, often on the same day. In return, the females will help defend the territory. No copulation occurs during the incubation period and during the first six weeks after the offspring are hatched. If the eggs are lost, the female will mate with the males once again.
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This is a collection of lists of mammal gestation period estimated by experts in their fields. The mammals included are only viviparous (marsupials and placentals) as some mammals, which are monotremes (including platypuses and echidnas) lay their eggs. A marsupial has a short gestation period, typically shorter than placental.