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All winter and early spring these pesky house sparrows continued to act like they “own” the former cliff swallow nesting sites, so in preparation for the early May possible return of the cliff ...
From 1981 to 1982, three independent swallow pairs were observed co-occupying the nest boxes of western bluebirds. These violet-green swallows protected the nesting site, removed fecal sacs from the boxes and fed the bluebird fledglings with no resistance from the adult western bluebirds.
The inside of a tree swallow nest A male gathering nesting material. The tree swallow has high rates of extra-pair paternity, 38% to 69% of nestlings being a product of extra-pair paternity, and 50% to 87% of broods containing at least one nestling that was the result of an extra-pair copulation. [14]
Providing the right environment. Providing birds with a safe and warm space is just as vital as extra food at this time of year. "Robins often use nest boxes as roosting sites during the winter ...
The barn swallow and house martin now rarely use natural sites. The purple martin is also actively encouraged by people to nest around humans and elaborate nest boxes are erected. Enough artificial nesting sites have been created that the purple martin now seldom nests in natural cavities in the eastern part of its range. [52]
The northern rough-winged swallow usually nests by itself, [5] although sometimes it is found in loose groups, often at the edge of bank swallow colonies, [6] of up to 25 pairs. [5] The nests are found in burrows located in soil banks, [ 12 ] very occasionally caves and trees, and in human-made cavities such as gutters and tubes.
After building the nest, barn swallows may nest colonially where sufficient high-quality nest sites are available, and within a colony, each pair defends a territory around the nest which, for the European subspecies, is 4 to 8 m 2 (40 to 90 sq ft) in size. Colony size tends to be larger in North America. [37]
The eastern red-rumped swallow breeds from April to July alone or semi-colonially with scattered nests. The nest is a retort or bottle-shaped structure, made from mud pellets and lined with dried grasses and feathers. The clutch is usually four, sometimes five, white eggs. Both sexes build the nest, and share incubation and the care of the young.