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Birds which build in trees generally have blue or greenish eggs, either spotted or unspotted, while birds that build in bushes or near or on the ground are likely to lay speckled eggs. The color of individual eggs is also genetically influenced, and appears to be inherited through the mother only, suggesting the gene responsible for ...
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 ...
Eggs of the wood stork. This bird lays one clutch of three to five cream coloured eggs that are about 68 by 46 millimetres (2.7 by 1.8 in) in size. [31] These eggs are usually laid one to two days apart [30] and incubated for 27 to 32 days [31] by both sexes. [30] This incubation period starts when the first egg is laid. [26]
A study using digital photography and spectrometry along with an automatic analytical approach to analyse cuckoo eggs and predict the identity of bird females based on their egg appearance showed that individual cuckoo females lay eggs with a relatively constant appearance, and that eggs laid by more genetically distant females differ more in ...
The male bird has a strong voice and sings from exposed perches to attract a mate. The chaffinch breeds in much of Europe, across the Palearctic to Siberia. The female builds a nest with a deep cup in the fork of a tree. The clutch is typically four or five eggs, which hatch in about 13 days
The eggs are elliptical, strong, and variably coloured with heavy speckling. The common nighthawk lays two 6–7 g (0.21–0.25 oz) eggs per clutch; the eggs are laid over a period of 1 to 2 days. [citation needed] The female alone displays a brood patch. The chicks may be heard peeping in the hours before they hatch.
The nests of these birds consist of a level platform, often created in the branches of trees by a series of dried leaves covered with bird droppings. One egg is laid each season, and nests are re-used in subsequent years.
Silvereyes breed in spring and early summer (mainly between September and December), making a tiny cup of grass, moss, hair, spiderweb, and thistledown, suspended from a branch fork in the outer reaches of small trees or shrubs. They lay two to four pale blue eggs, and two (or sometimes three) broods may be raised during each breeding season.