California Thrasher

The California Thrasher is a large, dark thrasher essentially endemic to the state for which it is named, closely tied to the dense chaparral that blankets many of California's hillsides. It has one of the longest, most strongly downcurved bills of any North American thrasher, an adaptation for probing deeply into soil and leaf litter beneath thick scrub.

Plumage is a fairly uniform dark grayish-brown above, with a pale buffy throat set off by a dark malar (mustache) stripe, and unstreaked warm buffy underparts. The bird is often secretive within the tangled chaparral but reveals itself with a loud, melodious song delivered from an open perch.

Key field marks

• Very long, strongly downcurved bill
• Dark grayish-brown upperparts
• Pale buffy throat contrasting with a dark malar stripe
• Long tail, often held cocked
• Unstreaked underparts

Similar species

Crissal Thrasher is similar in shape and unstreaked underparts but is paler overall and shows a chestnut undertail patch, with limited range overlap mainly in southeastern California deserts, whereas California Thrasher favors coastal and foothill chaparral. Le Conte's Thrasher is much paler and sandy-colored, found in more open desert habitat.

Habitat

California Thrashers are closely associated with dense chaparral and coastal sage scrub, favoring thick, continuous stands of shrubs on foothills and coastal slopes.

Range

The species is essentially endemic to California, found through much of the coastal ranges, foothills, and interior valleys of the state, with a small extension into northern Baja California, Mexico.

Migration

California Thrashers are non-migratory, remaining on territory year-round within their chaparral habitat.

Behavior

California Thrashers forage on the ground, using their long bills to dig and sweep through leaf litter and soil for insects and other invertebrates, and also eat berries and other fruit; they typically stay low and hidden within dense chaparral.

Voice

The song is loud, melodious, and highly varied, often incorporating mimicry of other birds, delivered from an exposed perch atop the chaparral, particularly in the early breeding season.

Nesting

Nests are built low within dense shrubs, constructed as a bulky cup of twigs lined with finer material. Females lay 2-4 pale blue-green eggs, and pairs often remain together on the same territory year after year.