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The smallest bird nests are those of some hummingbirds, tiny cups which can be a mere 2 cm (0.8 in) across and 2–3 cm (0.8–1.2 in) high. [1] At the other extreme, some nest mounds built by the dusky scrubfowl measure more than 11 m (36 ft) in diameter and stand nearly 5 m (16 ft) tall. [2] The study of birds' nests is known as caliology.
The birds will also nest in burrows or protected sites on the ground. [18] Barrow's goldeneyes tend not to share habitat with the much more numerous common goldeneye. Barrow's goldeneye tend to be territorial towards other birds venturing into their domain. This is especially true among the drakes. Confrontations may occur in the form of fighting.
The burrow also serves as a nesting site. The shoco lays 1 or 2 eggs every other day until all the eggs are laid. A shoco can lay up to 4 eggs, which are incubated for 3–4 weeks. The young owlets are cared for 3 months until they leave the nest. [4]
Two birds studied in the Parque Nacional de La Macarena of Colombia were free of blood parasites. [19] Burrowing owls often nest and roost in the burrows made by ground squirrels, a strategy also used by rattlesnakes. [18] When threatened, the owl retreats to the burrow and produces rattling and hissing sounds similar to those of a rattlesnake.
A category for birds which nest underground. ... Pages in category "Subterranean nesting birds" The following 12 pages are in this category, out of 12 total.
Many species will nest either on cliffs or on level ground but prefer cliffs, although Böhm's bee-eater always nests on level ground. The burrows are dug by both birds in the pair, sometimes assisted by helpers. The soil or sand is loosened with jabs of the sharp bill, then the feet are used to kick out the loose soil.
Other birds often built their own nests on top of Weaver nest sites. [4] Some birds build nests in trees, some (such as eagles, vultures, and many seabirds) will build them on rocky ledges, and others nest on the ground or in burrows. [3] Each species has a characteristic nest style, but few are particular about where they build their nests.
These burrows can be as much as 3 m deep into a cliff-face, connecting with other tunnels to create a labyrinth, ending in a nesting chamber. [8] Breeding pairs will reuse burrows from previous years but may enlarge them. [14] They nest in large colonies, some of the largest ever recorded for parrots, which is thought to reduce predation. [14]