The grey-backed tachuri (Polystictus superciliaris) is a species of bird in subfamily Elaeniinae of family Tyrannidae, the tyrant flycatchers. It is endemic to Brazil.[2]
| Grey-backed tachuri | |
|---|---|
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| In Serra da Canastra, Brazil | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Passeriformes |
| Family: | Tyrannidae |
| Genus: | Polystictus |
| Species: | P. superciliaris
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| Binomial name | |
| Polystictus superciliaris (Wied, 1831)
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Taxonomy and systematics
editThe grey-backed tachuri shares genus Polystictus with the bearded tachuri (P. pectoralis) but several authors have described the relationship as weak and needing confirmation.[3][4]
Description
editThe grey-backed tachuri is 9.5 to 10 cm (3.7 to 3.9 in) long and weighs about 6 grams (0.21 oz). The sexes have the same plumage. Adults have a gray crown with a short crest; the crown's white center is mostly hidden. They have a short white supercilium, a white eye ring, and a thin blackish line through the eye on a face that is otherwise thinly striped with black and white. Their upperparts are brownish gray. Their wings are dark dusky brown with slightly paler brown edges on the flight feathers and tips on the wing coverts; the last show as two wing bars. Their tail is dusky. Their chin is whitish. Their throat and underparts are mostly pinkish buff that becomes white on the lower belly. Juveniles have a cream-colored belly. Both sexes have a dark brown iris, a black bill , and black legs and feet.[4][5]
Distribution and habitat
editThe grey-backed tachuri has a disjunct distribution in eastern Brazil. One population is found in central Bahia. Another is found from northern Minas Gerais south into northern Paraná. It also occurs locally in scattered locations north and west of those main populations. It primarily inhabits campos rupestres, a rocky grassland biome with scattered shrubs. It also occurs in brushy deserted pastures and, at higher elevations, grasslands and brushy edges of cloudforest. In elevation it ranges from 900 to 2,300 m (3,000 to 7,500 ft) but is mostly found below 1,700 m (5,600 ft).[4][5]
Behavior
editMovement
editThe grey-backed tachuri is a year-round resident throughout its range.[4]
Feeding
editThe grey-backed tachuri feeds mostly on insects. It usually forages singly and sometimes in pairs or trios. It perches high in grass or a shrub, gleaning from the perch and making short flights just above the vegetation to hover-glean or move to another perch.[4]
Breeding
editThe grey-backed tachuri breeds between July and September. Its nest is a small cup made from rootlets and moss and is typically in a branch fork in a small shrub. The clutch is one or two eggs. The incubation period, time to fledging, and details of parental care are not known.[4]
Vocalization
editThe grey-backed tachuri's song is a "nervous, sustained 'tititi---' interrupted by toneless 'purrrrr' trill". Its call is a "series of thin, compact 'eeh-uk' " notes.[5]
Status
editThe IUCN originally in 1988 assessed the grey-backed tachuri as Threatened, then in 2004 as Near Threatened, and since 2011 as of Least Concern when its range was found to be larger than previously thought. Its population size is not known and is believed to be decreasing. "Increasing conversion of land for cattle ranching is currently the principal threat, although it persists in partially degraded areas."[1] It is considered generally uncommon and local. It occurs in several national parks.[4]
References
edit- ^ a b BirdLife International (2016). "Grey-backed Tachuri Polystictus superciliaris". IUCN Red List of Threatened Species. 2016: e.T22699423A93731152. doi:10.2305/IUCN.UK.2016-3.RLTS.T22699423A93731152.en. Retrieved 20 October 2024.
- ^ a b Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (August 2024). "Tyrant flycatchers". IOC World Bird List. v 14.2. Retrieved 19 August 2024.
- ^ Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, G. Del-Rio, A. Jaramillo, D. F. Lane, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 28 September 2024. A classification of the bird species of South America. American Ornithological Society. https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved September 29, 2024
- ^ a b c d e f g Fitzpatrick, J. W. (2020). Gray-backed Tachuri (Polystictus superciliaris), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.gybtac1.01 October 20, 2024
- ^ a b c van Perlo, Ber (2009). A Field Guide to the Birds of Brazil. New York: Oxford University Press. pp. 294–295. ISBN 978-0-19-530155-7.
External links
edit- Gray-backed Tachuri photos Archived 2015-07-10 at the Wayback Machine on antpitta.com