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The rufous-crowned sparrow is a non-migratory species, though the mountain subspecies are known to descend to lower elevations during severe winters. [11] Male sparrows maintain and defend their territories throughout the year. [11] This sparrow is found in open oak woodlands and dry uplands with grassy vegetation and bushes.
The red-billed quelea is a small sparrow-like bird, approximately 12 cm (4.7 in) long and weighing 15–26 g (0.53–0.92 oz), with a heavy, cone-shaped bill, which is red (in females outside the breeding season and males) or orange to yellow (females during the breeding season). [7]
The house sparrow is a compact bird with a full chest and a large, rounded head. Its bill is stout and conical with a culmen length of 1.1–1.5 cm (0.43–0.59 in), strongly built as an adaptation for eating seeds. Its tail is short, at 5.2–6.5 cm (2.0–2.6 in) long.
In a recent study, researchers estimated 862 million birds in the sparrow family have been lost since 1970, comprising the single largest proportion of the 3 billion birds lost overall.
Juvenile in Colombia Z. c. australis singing in Los Glaciares National Park, Patagonia, Argentina. The rufous-collared sparrow or Andean sparrow (Zonotrichia capensis) is an American sparrow found in a wide range of habitats, often near humans, from the extreme south-east of Mexico to Tierra del Fuego, and the island of Hispaniola (split between the Dominican Republic and Haiti) in the Caribbean.
The stripe-headed sparrow is a large, long-tailed species, 15.5 to 18 cm (6.1–7.1 in) long and weighing up to 35 g (1.2 oz). The adult has a black head with broad white stripes on the crown and above each eye.
The russet sparrow (Passer cinnamomeus), also called the cinnamon or cinnamon tree sparrow, is a passerine bird of the sparrow family Passeridae. A chunky little seed-eating bird with a thick bill, it has a body length of 14 to 15 cm (5.5–5.9 in). Its plumage is mainly warm rufous above and grey below.
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] The adult is brownish gray on the upperparts, with dusky streaks on the back. [9]