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The first flightless bird to arrive in each environment utilized the large flightless herbivore or omnivore niche, forcing the later arrivals to remain smaller. In environments where flightless birds are not present, it is possible that after the K/T Boundary there were no niches for them to fill. They were pushed out by other herbivorous mammals.
An audio recording of a house sparrow. The house sparrow (Passer domesticus) is a bird of the sparrow family Passeridae, found in most parts of the world. It is a small bird that has a typical length of 16 cm (6.3 in) and a mass of 24–39.5 g (0.85–1.39 oz).
The Cassin's sparrow is a fairly large, plain, grayish sparrow that lacks conspicuous markings. In flight, the long, roundish tail is obvious and the white tips of the tail feathers are sometimes apparent. This species is most easily identified by its distinctive song and dramatic skylarking behavior during the breeding season.
[2] [3] The type species was subsequently designated as the house sparrow (Passer domesticus). [3] [4] The name Passer is the Latin word for "sparrow." [5] A mixed group of Passer sparrows containing a Eurasian tree sparrow, a male house sparrow, and female house or Spanish sparrows, feeding on grain in the town of Baikonur, Kazakhstan
The saxaul sparrow's nests are untidy dome-shaped constructions, with an entrance in the side or top. They are built of grasses, roots, and other plant materials, and are lined with feathers, fur, and soft plant material. [31] [34] [36] The nest is mainly built by the female, though the male may actively take part in building.
The yellow-browed sparrow is a small American sparrow, measuring 13 cm (5 in) in length, [9] with a mass between 14.5 and 19 g (0.5 and 0.7 oz). [10] Sexes are similarly plumaged, though males average very slightly larger than females. [2]
Also, covert feathers; tectrices – singular: tectrix. A layer of non-flight feathers overlaying and protecting the quills of flight feathers. At least one layer of covert feathers appear both above and beneath the flight feathers of the wings as well as above and below the rectrices of the tail. [116] These feathers may vary widely in size.
The chestnut sparrow (Passer eminibey) is a species of passerine bird in the sparrow family Passeridae. It is the smallest member of the sparrow family, at about 11 cm (4.3 in) long. The breeding male has deep chestnut plumage and the female and juvenile are coloured a duller grey with some chestnut markings.