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In general smaller birds tend to hatch faster, but there are exceptions, and cavity nesting birds tend to have longer incubation periods. It can be an energetically demanding process, with adult albatrosses losing as much as 83 g of body weight a day. [6] Megapode eggs take from 49 to 90 days depending on the mound and ambient temperature.
The female incubates the eggs, which hatch after 13 to 16 days. ... a bluebird is 10 years and five months. [18] ... flocks numbering over 50 birds each flying across ...
It is a tough piece of skin which is resorbed less than two months after hatching. Crocodile eggs are similar to those of birds in that they have an inner membrane and an outer one. The egg tooth is used to tear open the inner membrane; the baby crocodile can then push its way through the outer shell.
These birds will sit on their egg in turns for two months, then spend another five or six months caring for their chick. After six months, the baby bird is ready to fly.
These birds are about 15 cm (5.9 in) long, including the outer tail feathers which are slightly shorter in the female. The welcome swallow's weight is about 9-20g. From the Gould collection in Tasmania a “natural size” male had a wing size of 11.1 cm (4.4 in), tail size of 7.4 cm (2.9 in), and a culmen of 0.7 cm (0.28 in).
In a study of 209 psychology students at the University of California, Berkeley, Eleanor Rosch found that the robin was, in the students' minds, the most prototypical example of a bird (though the students did not have the opportunity to specify the species of robin). [60] Robin egg blue is a color named after the color of the bird's eggs. [7]
Incubated by both parents, the eggs hatch after 19 days. Baby chimney swifts are altricial—naked, blind and helpless when they hatch. Fledglings leave the nest after a month. [57] The average chimney swift's life span is 4.6 years, [60] but one is known to have lived more than 14 years.
The span between precocial and altricial species is particularly broad in the biology of birds. Precocial birds hatch with their eyes open and are covered with downy feathers that are soon replaced by adult-type feathers. [17] Birds of this kind can also swim and run much sooner after hatching than altricial young, such as songbirds. [17]