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That way all of the eggs will hatch on the same day and the young will all grow and develop on the same schedule so that they all fledge at the same time. Some bluebirds will have eggs in early ...
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[14] [15] [16] From 1966–2015 the eastern bluebird experienced a greater than 1.5% annual population increase throughout most of its breeding and year-round ranges, with exceptions including southern Florida and the Ohio River valley. [17] Bluebirds tend to live in open country around trees, but with little understory and sparse ground cover.
Precocial birds can provide protein-rich eggs and thus their young hatch in the fledgling stage – able to protect themselves from predators and the females have less post-natal involvement. Altricial birds are less able to contribute nutrients in the pre-natal stage; their eggs are smaller and their young are still in need of much attention ...
The bluebirds are a North American [1] group of medium-sized, mostly insectivorous or omnivorous birds in the order of Passerines in the genus Sialia of the thrush family (Turdidae). Bluebirds are one of the few thrush genera in the Americas. Bluebirds lay an average of 4 to 6 eggs per clutch. They will usually brood two or three times in a year.
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Bird eggs are laid by ... This evolutionary trait results in kiwi chicks that can emerge from the nest days after hatching, ready to start foraging for food ...
The female incubates the eggs for 11–14 days before they hatch. Then the female feeds the offspring while the male teaches them to fly and leave the nest, usually within 18 days of birth. The male also feeds the offspring a little less than half the time, easing the burden on the female.