LeConte's Thrasher

Toxostoma lecontei

Order:
Passeriformes
Family:
Mimidae
Sections
  • Version: 2.0 — Published July 26, 2019
  • Jay M. Sheppard
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The Introduction Article is just the first of 11 articles in each species account that provide life history information for the species. The remaining articles provide detailed information regarding distribution, migration, habitat, diet, sounds, behavior, breeding, current population status and conservation. Each species account also includes a multimedia section that displays the latest photos, audio selections and videos from Macaulay Library’s extensive galleries. Written and continually updated by acknowledged experts on each species, Birds of North America accounts include a comprehensive bibliography of published research on the species.

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Figure 1. Historical distribution of LeConte's Thrasher.

Large areas within this range are unoccupied.

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LeConte's Thrasher.

LeConte's Thrasher is an uncommon resident of the deserts of the American Southwest and northwestern Mexico. With its plain, sandy coloration, LeConte's Thrasher blends in well with the dry desert vegetation. Note long, blackish tail, distinctly decurved bill, and uniform sandy colored, unspotted breast and upperparts. Eye is dark with no distinct superciliary. Undertail coverts are pale orange to ochraceous buff in color.

© Louis Hoeniger , Arizona , United States , 8 December 2018

LeConte's Thrasher was discovered by Dr. John LeConte, a Boston entomologist, in Yuma County, Arizona, in late 1850 or early 1851 (1, 2). Originally named "LeConte's Mocking Bird (3)," the species was known from only a handful of specimens and additional observations until about 1882 (4), with the first nest being described in 1883 (5). Over the ensuing 30 years, many hundreds of observations and specimens were obtained throughout its range.

LeConte's Thrasher remains an uncommon resident of the deserts of the southwestern United States and northwestern Mexico, where it inhabits some desolate environments. Water may be present for only a few days each year, and even then the bird rarely drinks—this species is a true xerophile. It feeds almost exclusively on arthropods that it digs from the litter under desert shrubs, and its normal mode of locomotion is to run between shrubs in the fashion of a Greater Roadrunner (Geococcyx californianus). With its rather plain, sandy coloration, this thrasher blends into the usually dry desert vegetation and pale ground surface, although while running it often holds its contrasting, nearly black, tail cocked high over its back.

Regular singing starts in early fall and peaks in December and January, and egg-laying begins in February and extends through May and early June. The species has no migration or seasonal movements, and pairs remain together year-round. Even in the most populated habitats, densities may reach only 10–12 adults per square kilometer. In some parts of its range, the LeConte's Thrasher has lost extensive habitat to development—irrigated lawns, groves, and agricultural fields are not compatible with its need for desert vegetation.

Unless otherwise indicated, the major source of information in this account is an intensive study of this species conducted between 1968 and 1971 by the author and involving a color-banded population of approximately 35 pairs (n = 353 banded birds, including ~90 adults) near Maricopa in the San Joaquin Valley of southwestern Kern County, California. The study included about 2,000 field hours at Maricopa and about 1,000 field hours elsewhere in the species' U.S. range, as well as examination of more than 600 specimens and ~700 egg-set and nest records from major collections and institutions around the United States (6, 7, 8).

Recommended Citation

Sheppard, J. M. (2019). LeConte's Thrasher (Toxostoma lecontei), version 2.0. In The Birds of North America (P. G. Rodewald, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bna.lecthr.02