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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]
Deep cup nest of the great reed-warbler. A bird nest is the spot in which a bird lays and incubates its eggs and raises its young. Although the term popularly refers to a specific structure made by the bird itself—such as the grassy cup nest of the American robin or Eurasian blackbird, or the elaborately woven hanging nest of the Montezuma oropendola or the village weaver—that is too ...
The team increased the annual output of Old Blue (and later other females) by removing the first clutch every year and placing the eggs in the nest of the Chatham race of the tomtit, a technique known as cross-fostering. The tomtits raised the first brood, and the black robins, having lost their eggs, relaid and raised another brood. [8]
If the eggs are lost, the female will mate with the males once again. This can lead to competition in some species. In cooperative simultaneous polyandry, multiple males mate with a single female and a clutch of mixed eggs (belonging to multiple males) is cared for by the whole group.
The red-capped robin (Petroica goodenovii) is a small passerine bird native to Australia. Found in drier regions across much of the continent, it inhabits scrub and open woodland. Like many brightly coloured robins of the family Petroicidae, it is sexually dimorphic. Measuring 10.5–12.5 cm (4.1–4.9 in) in length, the robin has a small, thin ...
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The fan-tailed cuckoo (Cacomantis flabelliformis) and pallid cuckoo (C. pallidus) have been recorded as brood parasites of the flame robin; [17] female cuckoos lay their eggs in robin nests, which are then raised by the robins as their own. One fan-tailed cuckoo was recorded ejecting baby robins before being raised by its foster parents.
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