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Bird ringing is the term used in the UK and in some other parts of Europe, while the term bird banding is more often used in the U.S. and Australia. [49] bird strike The impact of a bird or birds with an airplane in flight. [50] body down The layer of small, fluffy down feathers that lie underneath the outer contour feathers on a bird's body. [51]
Female birds are able to produce more of a certain gender of birds that are more likely to survive under extreme conditions. In birds, the females' egg determines the gender of the offspring, not the male's sperm. In zebra finches, a study showed the effect of food on gender ratio production. For females, egg production is a metabolically ...
This bird is an infrequent vagrant of Europe, with five individuals reported this century on the Azores [16] and a handful of records in Norway, [17] Ireland, [18] and Great Britain. [19] A live ovenbird on St Mary's , Isles of Scilly in October 2004 was in bad condition, and died despite being taken into care. [ 20 ]
The species is one of the first North American birds to lay eggs, and normally has two to three broods per breeding season, which lasts from April to July. [ 16 ] The nest is most commonly located 1.5–4.5 m (4.9–14.8 ft) above the ground in a dense bush or in a fork between two tree branches, and is built by the female alone.
[13] as well as range expansions of many other species of birds. [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]
The sharp-shinned hawk and other birds prey upon American bushtits. [4] Bushtits live in flocks of 10 to 40 birds and family members sleep together in their large, hanging nest during breeding season. Once the offsprings develop wings that are developed enough to fly, they leave the nest and sleep on branches.
They incubate them over a period of 23–25 days. Both parents are involved in the incubation process, taking turns during the day (except at night, where only the female incubates the eggs). [15] [14] Both parents take care of the newborn American avocets after they hatch.
The northern cardinal is the state bird of seven states, followed by the western meadowlark as the state bird of six states. The District of Columbia designated a district bird in 1938. [ 4 ] Of the five inhabited territories of the United States , American Samoa and Puerto Rico are the only ones without territorial birds.