Long-billed Thrasher

The Long-billed Thrasher (Toxostoma longirostre) is a large, elegant songbird primarily resident in the Rio Grande Valley of Texas and eastern Mexico. A member of the family Mimidae (which includes mockingbirds and catbirds), it is famous for its powerful, varied song and its habit of skulking in deep, thorny undergrowth. While it closely resembles the widespread Brown Thrasher, the Long-billed Thrasher has a much more restricted range, a grayer face, and highly contrasted blackish-streaked chest markings.

To successfully identify a Long-billed Thrasher, look for these distinctive characteristics:

• Bill & Face: Features a very long, dark, noticeably decurved bill with a slightly paler base on the lower mandible. The face is distinctly grayish, contrasting with the dark crown and rufous back.
• Plumage: The upperparts are a rich, dull rufous-brown (not as bright orange-coppery as the Brown Thrasher). The underparts are extremely crisp white, heavily marked with bold, blackish-brown teardrop streaks.
• Eyes & Wings: The iris is a vivid yellow-orange to bright orange. The wings feature two narrow, white or buff-colored wingbars.

Similar Species

• Brown Thrasher (Toxostoma rufum): Has a warmer, brighter rufous back, a buffier wash on the underparts, lighter brown (rather than jet-black) streaks, a warmer rufous-brown face, and a shorter, straighter bill.
• Curve-billed Thrasher (Toxostoma curvirostre): Generally pale gray-brown overall with faint, blurry breast spots rather than crisp, bold black streaks, and a more uniform grayish-brown head.

The Long-billed Thrasher is a specialist of dense, subtropical thorny shrublands and riparian woodlands. Its primary habitat is the Tamaulipan mezquital, characterized by mesquite, ebony, acacia (catclaw), and various spiny desert plants.

Range & Migration

• Geographic Range: Highly localized, extending from the southern tip of Texas (primarily the lower Rio Grande Valley) southward through eastern Mexico to Veracruz.
• Migration: This species is strictly non-migratory. It maintains year-round territories and can be found in the same dense thickets throughout all seasons.

Foraging & Diet

Like other thrashers, this species spends much of its time foraging on the ground. It sweeps its long, curved bill from side to side to dig through heavy leaf litter, soil, and debris in search of beetles, caterpillars, ants, and other invertebrates. It also consumes small fruits, berries, and seeds, especially during the winter months.

Voice

Its song is a brilliant, loud sequence of rich, musical notes, with phrases typically repeated twice (e.g., 'cherru-cherru, tlip-tlip, wheew-wheew'). It is highly reminiscent of the Brown Thrasher but is often described as having a sweeter, more liquid quality. Common calls include a sharp, metallic 'tyack' or 'smack' and a loud, slurred whistle, 'kleep'.

Nesting & Breeding

Long-billed Thrashers construct a bulky, cup-shaped nest cup deep within the protection of thorny shrubs or small trees, such as acacia, mesquite, or cactus. The nest is woven from thorny twigs and lined with finer grasses, rootlets, and bark. Both partners help build the nest and share incubation duties for the 2 to 5 pale greenish-white, brown-speckled eggs.