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Rose-bellied Bunting Passerina rositae Scientific name definitions

David Brewer
Version: 1.0 — Published March 4, 2020
Text last updated January 15, 2019

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Introduction

With its shocking color combination of turquoise and raspberry pink, Rose-bellied Bunting (Rosita's Bunting) is one of Mexico’s most distinctively plumaged birds.  Endemic to the Pacific Slope east of the Isthmus of Tehuantepec, it is found in southeastern Oaxaca and southwestern Chiapas. It occurs in moist to semi-arid woodlands at elevations of 150-800 m. The IUCN considers it Near Threatened due to its small range and threats of habitat loss. Rosita's Bunting, as the species is best known, was discovered by A. L. François Sumichrast a naturalist who resided in Orizaba before moving to the Pacific Slope of Oaxaca where he discovered this species. He named it after his wife, thinking that the bunting and his wife were the two most beautiful creatures he had seen.

Field Identification

13·5–14·5 cm; 19·5–20·5 g (Chiapas). Male is bright electric-blue above, purplish-blue on crown, becoming brighter on lower back and rump; lores dark, white eyering broken in front and behind (giving two crescents); shoulder bright blue, primaries and secondaries greyish-black with broad blue edgings (giving overall blue appearance to closed wing); rectrices bright blue with black shafts; chin greyish-white, throat and chest blue, reddish-pink mottling on chest becoming salmon-pink on belly and vent; flanks blue; iris dark brown; bill blackish above, pale greyish-blue below; legs lead-grey. Female has head and upperparts greyish-brown, sometimes with hint of bluish, becoming bluish on rump; wing feathers dull brown, buff-brown edging is less contrasting than on similar congeneric females, rectrices grey with bluish on outer webs; face grey-brown, pale broken eyering; buffy brown or pinkish-buff below , becoming warmer on throat to lower breast and paler on lower belly; bare parts as for male. Immature male has crown dull grey-black, bright deep indigo-blue feathers growing through as moult progresses, back grey-brown with bright blue patches, uppertail-coverts bright blue, chin whitish, throat, chest and belly rose-coloured, lower belly yellowish-buff; immature female similar to adult, but generally duller, with only faint blue on uppertail-coverts and rump, underparts dusky buff.

Systematics History

Monotypic.

Subspecies

Monotypic.

Distribution

E Oaxaca (W to c. 97° W) and W Chiapas (E to c. 93° W; recently recorded further E, in El Triunfo Biosphere Reserve (1) ), in S Mexico.

Habitat

Arid and semi-arid thorn-forest, denser parts of deciduous forest, also semi-humid deciduous gallery woodland, also swamp-forest; sometimes associated with pasture edge. At 180–800 m.

Movement

Largely sedentary; in some locations in Chiapas present in some months and less common or absent in others.

Diet and Foraging

No information available on diet. Forages singly and in pairs. Occurs at lower to middle levels.

Sounds and Vocal Behavior

Song  a sweet, slightly burry warble; call  note a wet “plik” or “plek”.

Breeding

Only two nests described, one with fresh eggs on 30th Jul and one with heavily incubated eggs on 29th Jun. Nest an open cup made from dead leaves, shredded bark and fine weed stems, lined with finer plant material, external diameter 10–12 cm, internal cup 4–5·5 cm, each in crotch of small sapling at height of 1·5 m and 4 m, respectively. Clutch 3 or 4 eggs, plain white or light bluish, spotted and blotched, especially at blunt end, with reddish-brown or lavender. No other information.
Not globally threatened. Currently considered Near-threatened. Restricted-range species: present in Isthmus of Tehuantepec EBA. Locally fairly common to common within its limited range. Global population estimated at fewer than 50,000 individuals. Possibly declining because of habitat degradation. Within overall indicated range, not all habitat is suitable for this species; for example, in La Sepultura Biosphere Reserve (Chiapas), less than 20% was found to be suitable. Notwithstanding its attractive plumage, does not appear to be threatened by trapping for cagebird trade.
Distribution of the Rose-bellied Bunting - Range Map
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  • Year-round
  • Migration
  • Breeding
  • Non-Breeding
Distribution of the Rose-bellied Bunting

Recommended Citation

Brewer, D. (2020). Rose-bellied Bunting (Passerina rositae), 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.robbun1.01
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