The sage thrasher (Oreoscoptes montanus) is a medium-sized passerine bird from the family Mimidae, which also includes mockingbirds, tremblers, and New World catbirds. It is the only member of the genus Oreoscoptes. This seems less close to the Caribbean thrashers, but rather to the mockingbirds instead (Hunt et al. 2001, Barber et al. 2004).
| Sage thrasher | |
|---|---|
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| In New Jersey, USA | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Passeriformes |
| Family: | Mimidae |
| Genus: | Oreoscoptes Baird, 1858 |
| Species: | O. montanus
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| Binomial name | |
| Oreoscoptes montanus (Townsend, 1837)
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Breeding range Migration Nonbreeding
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Description
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Oreoscoptes montanus are pale grey-brown on the upperparts and white with dark streaks on the underparts. They have a slim straight relatively short bill, yellow eyes and a long tail, although not as long as that of other thrashers.
Measurements:[2]
- Length: 7.9-9.1 in (20-23 cm)
- Weight: 1.4-1.8 oz (40-50 g)
- Wingspan: 12.6 in (32 cm)
Breeding
editAs its name suggests, this bird breeds in western North America, from southern Canada to northern Arizona and New Mexico. Its breeding habitat is in areas with dense stands of sagebrush and rarely in other shrubby areas. Their nests are made of twigs, rootlets and bark strips, lined with fine rootlets.[3] The female lays 4 or 5 eggs in a twiggy cup nest built in a low bush. Both parents incubate and feed the young birds.
Migrating
editIn winter, these birds migrate to the southernmost United States and Mexico, including the Baja Peninsula, north and south.
Diet
editThey mainly eat insects in summer; they also eat berries, especially in winter. They usually search for insects on the ground in brushy locations.
Vocalization
editThe male bird sings a series of warbled notes to defend his nesting territory.
Conservation
editThese birds have declined in some areas where sagebrush has been removed but are still common where suitable habitat remains. The continued decline of sagebrush habitats in western North America is cause for alarm for this and other sagebrush dependent species.
References
edit- ^ BirdLife International (2016). "Oreoscoptes montanus". IUCN Red List of Threatened Species. 2016: e.T22711096A94277324. doi:10.2305/IUCN.UK.2016-3.RLTS.T22711096A94277324.en. Retrieved 13 November 2021.
- ^ "Sage Thrasher Identification, All About Birds, Cornell Lab of Ornithology". www.allaboutbirds.org. Retrieved 2020-09-29.
- ^ "THE BIRD BOOK".
- Barber, Brian R.; Martínez-Gómez, Juan E. & Peterson, A. Townsend (2004): Systematic position of the Socorro mockingbird Mimodes graysoni. J. Avian Biol. 35: 195–198. doi:10.1111/j.0908-8857.2004.03233.x (HTML abstract)
- Hunt, Jeffrey S.; Bermingham, Eldredge; & Ricklefs, Robert E. (2001): Molecular systematics and biogeography of Antillean thrashers, tremblers, and mockingbirds (Aves: Mimidae). Auk 118(1): 35–55. DOI:10.1642/0004-8038(2001)118[0035:MSABOA]2.0.CO;2 HTML fulltext without images
External links
edit- Sage Thrasher Species Account - Cornell Lab of Ornithology
- Sage Thrasher Oreoscoptes montanus - USGS Patuxent Bird Identification InfoCenter
- Sage Thrasher photo gallery VIREO
- Sage Thrasher videos on the Internet Bird Collection
- Photo and description - Utah Division of Wildlife Resources