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Egg tossing is observed in avian species, most commonly females, [3] who are involved with cooperative breeding or brood parasitism. [1] Among colonial non-co-nesting birds, egg-tossing is observed to be performed by an individual of the same species, and, in the case of brood parasites, this behavior is done by either the same or different ...
The goldeneye often lays its eggs in the nests of other females, one of 74 species of Anseriformes to do so. [25] In many socially monogamous bird species, there are extra-pair matings resulting in males outside the pair bond siring offspring and used by males to escape from the parental investment in raising their offspring. [26]
With more than 140 families and some 6,500 identified species, [1] Passeriformes is the largest order of birds and among the most diverse clades of terrestrial vertebrates, representing 60% of birds. [ 2 ] [ 3 ] Passerines are divided into three suborders : Acanthisitti (New Zealand wrens), Tyranni (composed mostly of South American suboscines ...
The birds named "whydahs" [1] have long or very long tails in the breeding male. All are obligate brood parasites, which lay their eggs in the nests of estrildid finch species; most indigobirds use firefinches as hosts, whereas the paradise whydahs choose pytilias.
The red-winged blackbird (Agelaius phoeniceus) is a passerine bird of the family Icteridae found in most of North America and much of Central America. It breeds from Alaska and Newfoundland south to Florida, the Gulf of Mexico, Mexico, and Guatemala, with isolated populations in western El Salvador, northwestern Honduras, and northwestern Costa Rica.
Bird eggs are usually laid in a nest. Most species create somewhat elaborate nests, which can be cups, domes, plates, mounds, or burrows. [233] Some bird nests can be a simple scrape, with minimal or no lining; most seabird and wader nests are no more than a scrape on the ground.
The birds are best known for building massive nest mounds of decaying vegetation, which the male attends, adding or removing litter to regulate the internal heat while the eggs develop. However, some bury their eggs in other ways; there are burrow-nesters which use geothermal heat, and others which simply rely on the heat of the sun warming the ...
All Papuan bowerbirds lay one egg, while Australian species lay one to three with laying intervals of two days. [ 6 ] [ 7 ] Bowerbird eggs are around twice the weight of those of most passerines of similar size [ 8 ] [ 9 ] – for instance eggs of the satin bowerbird weigh around 19 g (0.67 oz) as against a calculated 10 g (0.35 oz) for a ...