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Eastern bluebirds measure 16–21 cm (6.3–8.3 in) long, span 25–32 cm (9.8–12.6 in) across the wings, and weigh 27–34 g (0.95–1.20 oz). [12] [11] Male bluebirds have a bright head, back, and wings. Their breast is a brownish red. [12] Females are lighter with gray on the head and back and some blue on their wings and tail.
The female ostriches will lay their eggs at the same time, leading to having too many eggs in the nest. [2] The major hen is able to detect which eggs belong to her, and will push the other eggs to the perimeter of the nest, which is not looked after. This adaption of abandoning these eggs protects the well-kept eggs from predators. [2]
If the female accepts the male and the nesting site, she alone builds the nest and incubates the eggs. Predators of young bluebirds in the nests can include snakes, cats, and raccoons. Bird species competing with bluebirds for nesting locations include the common starling, American crow, and house sparrow, which take over the nesting sites of ...
Typically, the bluebirds build their nest in early April and can lay their clutch of eggs any time after that — laying one egg a day — then starting to incubate them after the final egg is laid.
Volunteers at Maybury State Park keep an eye on bluebird nesting boxes, watching for predators, counting eggs and fledglings.
Bluebirds have two or three nestings per year so do not give up trying to attract them. Keep monitoring your bluebird nest boxes and make sure that they aren’t occupied by house sparrows.
In remote areas, these birds are less affected by competition for natural nesting locations than other bluebirds. Mountain bluebirds are monogamous. After the couple decides together on an ideal nesting site, the female will typically build their nest themselves out of thin, dry material from the surrounding landscape while the male protects ...
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