Bell's Sparrow

Overview

Bell's Sparrow occupies chaparral, coastal sage scrub, and desert scrub habitats primarily in California and parts of adjacent states, generally in drier and more southerly habitat than the closely related Sagebrush Sparrow. The two species were once treated as a single taxon and remain very similar in appearance.

Bell's Sparrow tends to look darker overall with a bolder facial pattern, features that become useful when the two species' ranges are in relatively close proximity.

Feather Identification

• Head feathers: darker gray overall than Sagebrush Sparrow, with a more prominent, sharply defined dark malar stripe
• Face feathers: white eye-ring and supraloral spot present but set against darker overall face tones, increasing contrast
• Back feathers: relatively plain grayish-brown, less streaked than in Sagebrush Sparrow
• Breast feathers: plain whitish-gray with a small dark central spot, similar in pattern to its close relative
• Compared to Sagebrush Sparrow: Bell's Sparrow shows an overall darker, more richly toned plumage with a bolder malar stripe and plainer back, differing from the paler, more streaked-backed Sagebrush Sparrow

Plumage Notes

Sexes look alike. Some geographic variation exists across the species' range, with birds in more coastal, humid habitats appearing somewhat darker than those in drier desert-edge populations. Juveniles show finer overall streaking and a less bold facial pattern, gradually acquiring the adult appearance through their first fall molt. A single complete molt follows breeding in adults, refreshing the darker overall plumage tones and bold malar stripe that define the species relative to Sagebrush Sparrow.

Habitat & Range

Bell's Sparrows are largely resident within California chaparral, coastal sage scrub, and adjacent desert scrub habitats, with some populations extending into similar habitat in Baja California. They generally occupy habitat somewhat farther south and west than the interior sagebrush-steppe favored by Sagebrush Sparrow. The species favors dense, low shrub cover for both nesting and foraging, tolerating a range of scrubland types from coastal sage scrub to drier desert-edge chaparral.

Behavior & Field Notes

Bell's Sparrows forage on the ground and within dense shrub cover, feeding on seeds and invertebrate food, often staying low and somewhat secretive outside of the breeding season. Males sing from exposed perches atop shrubs during the breeding season. The song is a series of varied buzzy notes and short phrases, generally faster-paced than that of Sagebrush Sparrow. Nests are built low within dense chaparral or sage scrub shrubs, constructed as a compact cup.