Swainson's Sparrow or House Sparrow?

Here's how to tell the difference

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Swainson's Sparrow

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House Sparrow

Swainson's Sparrow

Passer swainsonii

General appearance

Swainson's sparrows possess a predominantly brownish-grey coloration with dark streaks along the back and wings. They are small, measuring around 12.7–15 cm in length and 18–24 cm in wingspan. The underparts are pale grey, with a distinguishable buff eye-ring and line behind the eye.

Male vs female

Males and females look similar in appearance with no significant variations. Both sexes have similar coloration and size. In the breeding season, however, males may exhibit a slightly brighter colour in order to attract mates, a common trait in several bird species.

Juvenile

Juvenile Swainson's sparrows display similar coloration and patterns to adults, but maybe a bit duller. Their feathers often have a more loosely textured appearance, distinguishing them from adults. As they mature, they grow into their sleeker plumage, resembling more closely the adult birds.

Size

6.1 - 6.5 in/1.0 - 1.2 oz

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How to tell the Swainson's Sparrow from the House Sparrow

Visual differences

Swainson's Sparrow and House Sparrow both measure around 6-6.5 inches in length and weigh 0.95-1.1 ounces. Swainson's Sparrow has predominantly brownish-gray plumage with dark streaks and a buff eye-ring. It lacks the distinct sexual dimorphism seen in House Sparrows, where males boast gray crowns, chestnut-brown napes, and black bibs, while females are duller with grayish-brown tones and a pronounced eye stripe. House Sparrows have a stocky build with a stout bill and smoother body, whereas Swainson's Sparrow appears slightly slimmer.

Key differences and behavior

Swainson's Sparrow and House Sparrow both thrive near human habitations, but Swainson's Sparrow is more common in Ethiopian towns, while House Sparrow is widespread in urban and rural areas globally. Swainson's Sparrow forms large flocks outside breeding, whereas House Sparrows are noted for social singing and roosting in groups. Swainson's Sparrows prefer tall grass prairies, migrating to warmer regions in winter, while House Sparrows are adaptable to various environments including urban and isolated settings. Both species consume seeds and insects but differ in nesting habits; Swainson's Sparrow prefers shrubs or low trees for complex courtship displays, while House Sparrow often nests in enclosed niches.

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