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In most of eastern Asia, the house sparrow is entirely absent, replaced by the Eurasian tree sparrow. [99] Where these two species overlap, the house sparrow is usually more common than the Eurasian tree sparrow, but one species may replace the other in a manner that ornithologist Maud Doria Haviland described as "random, or even capricious". [100]
Passer is a genus of sparrows, also known as the true sparrows. The genus contains 28 species and includes the house sparrow and the Eurasian tree sparrow, two of the most common birds in the world. They are small birds with thick bills for eating seeds, and are mostly coloured grey or brown.
The International Ornithological Committee (IOC) recognizes these 140 species in the New World sparrow family Passerellidae, distributed among 30 genera in the following sequence. [1] One extinct species, the Bermuda towhee (†), is included. Confusingly, only 69 of the 140 include "sparrow" in their name.
Old World sparrows are generally social birds, with many species breeding in loose colonies and most species occurring in flocks during the non-breeding season. The great sparrow is an exception, breeding in solitary pairs and remaining only in small family groups in the non-breeding season.
New World sparrows are a group of mainly New World passerine birds, forming the family Passerellidae. They are seed-eating birds with conical bills, brown or gray in color, and many species have distinctive head patterns.
The Old World sparrow genus Passer is a group of small passerine birds that is believed to have originated in Africa, and which contains 15–25 species depending on the authority. [10] Its members are typically found in open, lightly wooded, habitats, although several species, notably the house sparrow ( P. domesticus ) have adapted to human ...
The Savannah sparrow (Passerculus sandwichensis) is a small New World sparrow that is the only member of the genus Passerculus.It is a widespread and abundant species that occupies open grassland habitats in North America.
The fox sparrow (Passerella iliaca) is a large New World sparrow. It is the only member of the genus Passerella , although some authors split the species into four (see below). Taxonomy