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Especially in warmer areas, the house sparrow may build its nests in the open, on the branches of trees, especially evergreens and hawthorns, or in the nests of large birds such as storks or magpies. [ 133 ] [ 142 ] [ 145 ] In open nesting sites, breeding success tends to be lower, since breeding begins late and the nest can easily be destroyed ...
Cyathus striatus, commonly known as the fluted bird's nest, [5] [6] is a common saprobic bird's nest fungus with a widespread distribution throughout temperate regions of the world. This fungus resembles a miniature bird's nest with numerous tiny "eggs"; the eggs, or peridioles , are actually lens-shaped bodies that contain spores .
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.
Blue jays can be very aggressive to other birds; they sometimes raid nests and have even been found to have decapitated other birds. [3] It builds an open cup nest in the branches of a tree; both sexes participate. The clutch may be two to seven eggs, which are blueish or light brown with darker brown spots.
The nests are located in rock crevices, in caves, under cliff overhangs or on buildings. [44] 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 ...
The co-parenting term “bird nesting” is taken from the image in nature when the mama and papa birds go back and forth to care for their hatchlings in the nest.
Known predators of house wrens at the nest include cats, rats, opossums, woodpeckers, foxes, raccoons, squirrels, snakes and owls. Adults away from the nests can usually avoid these predators although both small hawks and owls occasionally take free-flying adult wrens.
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