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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 eastern rock nuthatch builds a similar but less complex structure across the entrance to a cavity. Its nest can be quite small but may weigh up to 32 kg (70 lb). This species will also nest in river banks or tree holes and will enlarge its nest hole if it the cavity is too small. [45]
Both sexes build a large domed nest that has a side entrance. [28] It is chiefly composed of grasses and small twigs but can also incorporate lichen, string, and plastic. [29] [30] The birds will steal material from other nests. [28] The nest is placed in a wide range of sites, often in an exposed position high up in a tree or on man-made ...
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 nest is an underground horizontal oval chamber lined with shredded bark, linked by a tunnel 0.5 to 1.5 metres (1 ft 8 in to 4 ft 11 in) long to a hole in the side of a riverbank or slope in a shaded location. [18] The chamber is generally higher than the entrance tunnel, presumably to avoid flooding. [4]
S. c. carolinensis in Algonquin Provincial Park, Canada. The white-breasted nuthatch is a medium-sized nuthatch, measuring about 15.5 cm (6.1 in) in length. [9] Like other members of its genus, it has a large head, short tail, short wings, a powerful bill and strong feet; it is 13–14 cm (5.1–5.5 in) long, with a wingspan of 20–27 cm (7.9–10.6 in) and a weight of 18–30 g (0.63–1.06 oz).