Southern Gray-Headed Sparrow or Swainson's Sparrow?

Here's how to tell the difference

Southern Gray-Headed Sparrow image 1
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Southern Gray-Headed Sparrow

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Swainson's Sparrow image 1
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Swainson's Sparrow

Southern Gray-Headed Sparrow

Passer diffusus

General appearance

The southern gray-headed sparrow is a small bird with a length of 15-17 cm and a weight of 20-25 g. It has a pale, gray head and neck, white underparts, and a brown streaked back and wings. It also possesses a distinctive, dark bill and eyes surrounded by a white eyestripe.

Male vs female

In the case of southern gray-headed sparrows, both males and females exhibit similar plumage colors, making gender determination difficult. However, males are slightly larger and tend to have thicker bills.

Juvenile

Juvenile southern gray-headed sparrows, on the other hand, have less distinctive coloration than adults. They display a duller, more brownish-gray head and neck, and their underparts are tinged with pale brown. Their dark bill and eyes are also less prominent than in adults.

Size

5.9 - 6.3 in/0.7 - 1.1 oz

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How to tell the Southern Gray-Headed Sparrow from the Swainson's Sparrow

Visual differences

Southern Gray-Headed Sparrows are 5.9-6.3 inches long and weigh 0.7-0.9 ounces, with a pale gray head, dark bill, white underparts, and brown streaked back. Swainson's Sparrows are slightly smaller at 5-5.9 inches and lighter, 0.6-0.8 ounces, with brownish-grey plumage, pale grey underparts, and a buff eye-ring. The Southern Gray-Headed has a white eyestripe, while Swainson's displays a line behind the eye. Both sexes of both species look similar, but Swainson's may have slightly brighter males during the breeding season.

Key differences and behavior

The Southern Gray-Headed Sparrow (SGHS) and Swainson's Sparrow (SS) exhibit notable behavioral differences. SGHS, residents of open woodlands and savannahs in central and southern Africa, are less social, typically found in pairs or small groups, while SS, common in Ethiopian towns, form large flocks outside breeding seasons. SGHS favor seeds and insects, foraging on the ground in low vegetation and adapt well to urban environments, often visiting feeders. SS, primarily found in North American tall grass prairies and migratory to wintering grounds in the southeastern U.S., also consume seeds and insects but have more intricate courtship displays, including singing and aerial acrobatics. SGHS build nests in cavities, while SS construct cup-shaped nests in low shrubs; both species share parental duties, but SS males actively display in pursuit of mates.

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