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A common species nest that the cuckoo will choose to place its eggs in is the reed warbler. [7] The common cuckoo distinguishes the warbler's nest and will choose what specific nest to brood in depending on the foliage and distance from the nest. [7] The common cuckoo demonstrates the egg tossing behavior when they are just hatchlings. [14]
Precociality is thought to be ancestral in birds. Thus, altricial birds tend to be found in the most derived groups. There is some evidence for precociality in protobirds [11] and troodontids. [12] Enantiornithes at least were superprecocial in a way similar to that of megapodes, being able to fly soon after birth. [4]
Fledglings then leave the nest 15 to 20 days after hatching. [11] Juvenile (left) with parent Eastern bluebird at nesting box Eastern bluebird in Quebec, Canada. Both parents cooperate in raising the young, which they feed a diet consisting almost entirely of insects. Some young stay around the nest to help raise another brood.
This term is most frequently applied to birds, but is also used for bats. [1] [2] For altricial birds, those that spend more time in vulnerable condition in the nest, the nestling and fledging stage can be the same. For precocial birds, those that develop and leave the nest quickly, a short nestling stage precedes a longer fledging stage. [3]
The females leave the nest after finishing laying to let the males incubate the eggs and take care of the young. [4] Male emus ( Dromaius novaehollandiae ) become broody after their mates start laying, and begin to incubate the eggs before the laying period is complete.
It may occur in other situations. For example, female eiders prefer to lay eggs in the nests with one or two existing eggs of others because the first egg is the most vulnerable to predators. The presence of others' eggs reduces the probability that a predator will attack her egg when a female leaves the nest after laying the first egg. [23]
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Bluebirds lay an average of 4 to 6 eggs per clutch. They will usually brood two or three times in a year. Bluebirds nest from March all the way through August. Bluebirds have blue, or blue and rose beige, plumage. Female birds are less brightly colored than males, although color patterns are similar and there is no noticeable difference in size.