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In many species, parents continue to care for their fledged young, either by leading them to food sources, or feeding them. Birds are vulnerable after they have left the nest, but before they can fly, though once fledged their chances of survival increase dramatically. [5] A pigeon fledgling on a tiled floor
The incubation period is normally 14–19 days, with another 18–23 days before the altricial chicks fledge. The fledged young stay with, and are fed by, the parents for about a week after leaving the nest. Occasionally, first-year birds from the first brood will assist in feeding the second brood. [7]
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.
One of the most important things to remember to help the bluebirds is to stop the invasive non-native house (English) sparrows from nesting in those bluebird nest boxes. House sparrows are vicious ...
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They also appropriate nests of other mid-sized songbirds as long as these are placed in suitable spots; American robin nests are commonly used by blue jays, for example. Blue jays typically form monogamous pair bonds for life. Both sexes build the nest and rear the young, though only the female broods them.
Keep monitoring your bluebird nest boxes and make sure that they aren’t occupied by house sparrows. Also keep the nest boxes cleaned out so they are ready for a new nesting.
The adult western house martin is 13 cm (5 in) long, with a wingspan of 26–29 cm (10– 11 + 1 ⁄ 2 in) and a weight averaging 18.3 g (21 ⁄ 32 oz). It is steel-blue above with a white rump, and white underparts, including the underwings; even its short legs have white downy feathering.