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The size of the nest box also affects the bird species likely to use the box. Very small boxes attract wrens and treecreepers and very large ones may attract ducks and owls. Seasonally removing old nest material and parasites is important if they are to be successfully re-used. The material used in the construction may also be significant.
The Eurasian blue tit will nest in any suitable hole in a tree, wall, or stump, or an artificial nest box, often competing with house sparrows or great tits for the site. Few birds more readily accept the shelter of a nesting box; the same hole is returned to year after year, and when one pair dies another takes possession.
For example, if 2 pigeons are randomly assigned to 4 pigeonholes, there is a 25% chance that at least one pigeonhole will hold more than one pigeon; for 5 pigeons and 10 holes, that probability is 69.76%; and for 10 pigeons and 20 holes it is about 93.45%.
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.
An unusual singing bird box by Frères Rochat, ca. 1810. The bird is shown in a tiny cage, not concealed inside the box as usual. A singing bird box (boîte à oiseau chanteur in French) is a box, usually rectangular-shaped, which contains within a miniature automaton singing bird concealed below an oval lid and activated by means of an operating lever.
Even mammals such as raccoons may use them. Other woodpeckers and smaller birds, such as wrens, may be attracted to pileated holes to feed on the insects found in them. Ecologically, the entire woodpecker family is important to the well-being of many other bird species. The pileated woodpecker also nests in boxes about 4.6 m (15 ft) off the ground.