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Great Black-backed Gull (Larus marinus), small clutch.Clutch size refers to the number of eggs laid in a single brood by a nesting pair of birds. The numbers laid by a particular species in a given location are usually well defined by evolutionary trade-offs with many factors involved, including resource availability and energetic constraints.
A tree pipit nest found in clearfell habitat, Northern England, holding a clutch of six eggs of the darker variation. Tree pipits nest on the ground amongst grass or heather tussocks. The nest is built by the female. The clutch of 4 to 6 eggs is incubated by the female. The eggs hatch after 12–14 days.
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 ...
They lay two to three eggs in a tree nest. The call of the Asian fairy-bluebird is a liquid two note Glue-It. As the names would suggest, the Asian fairy-bluebird (I. puella) occurs across southern Asia, the Philippine fairy-bluebird (I. cyanogastra) in that archipelago, and the Palawan fairy-bluebird (I. tweeddalii) [2] on the island of Palawan.
The breeding season lasts from July to February with the majority of eggs laid from September until late October. Incubating is undertaken by the breeding female only. [2] The nest is usually located in a tree hollow beneath a canopy, often nearby the boundary of another brown treecreeper territory to attract extra help feeding.
A clutch of eggs is the group of eggs produced by birds, amphibians, or reptiles, often at a single time, particularly those laid in a nest. In birds, destruction of a clutch by predators (or removal by humans, for example the California condor breeding program) results in double-clutching. The technique is used to double the production of a ...
The tree swallow lays a clutch of two to eight, although usually four to seven, [14] pure white, and translucent at laying, eggs that measure about 19 by 14 mm (0.75 by 0.55 in). [53] These eggs are incubated by the female, [14] usually after the second-to-last egg is laid, [54] for 11 to 20 days, [53] although most
Mid-19th century illustration showing the eggs of a number of bird species. Oology (/ oʊ ˈ ɒ l ə dʒ i /; [1] also oölogy) is a branch of ornithology studying bird eggs, nests and breeding behaviour. The word is derived from the Greek oion, meaning egg.