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Eastern bluebird at the entrance of a nest box. A nest box, also spelled nestbox, is a man-made enclosure provided for animals to nest in. Nest boxes are most frequently utilized for birds, in which case they are also called birdhouses or a birdbox/bird box, but some mammals such as bats may also use them.
The entry holes are usually oblong and six to nine inches (152–228 mm) [3] that permits a single bird to enter with space for a safe landing and passage to the interior whilst at the same time excluding larger predators. [1] Owl holes without landing platforms had grooves or rough surfaces beneath the hole to aid grip.
The Australian boobook nests in holes in trees between 1 and 20 m (3–70 ft) above the ground. [25] The holes are generally vertical, and mostly in eucalypts, though other trees such as coast banksia (Banksia integrifolia) have been recorded. Some sites are reused by the species for up to 20 years, especially if broods have been successfully ...
Juveniles and first-year birds can be almost indistinguishable from adults. [7] The sizes of nuthatches vary, [7] from the large giant nuthatch, at 195 mm (7.7 in) and 36–47 g (1.3–1.7 oz), [22] to the small brown-headed nuthatch and the pygmy nuthatch, both around 100 mm (3.9 in) in length and about 10 g (0.35 oz). [23]
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 ...
Bird measurement or bird biometrics are approaches to quantify the size of birds in scientific studies. The variation in dimensions and weights across birds is one of the fundamental sources of diversity among birds, and even Within species, dimensions may vary across populations within species, between the sexes and depending on age and ...