Rose-bellied Bunting

The Rose-bellied Bunting is a range-restricted songbird found only in a small area of tropical deciduous forest around the Isthmus of Tehuantepec in Oaxaca, Mexico. Males show a combination of turquoise-blue upperparts and head with a soft rose-pink wash across the belly, a color combination not shared by any other bunting in the region. Females are much plainer, olive above and buffy below with a subtle pink tinge that hints at the male's pattern.

Adult male head, throat, and back feathers show a bright turquoise-blue, while the belly and lower underparts show a distinctive soft rose-pink wash, creating a two-toned pattern that is diagnostic within its limited range. The wings and tail are predominantly blue without strong contrasting wing bars. Females show olive-green upperparts and buffy underparts with a faint pink tinge on the belly that echoes the male's more vivid rose color, though much more subdued and easily overlooked.

Adult males show their brightest turquoise-and-rose plumage when feathers are fresh, with some dulling as feathers wear later in the season. Females remain olive and buffy year-round with minimal seasonal variation. As with other Passerina buntings, first-year males may show a mix of adult and immature-type feathering before completing their transition to full adult plumage.

This species has a very restricted range, found only in tropical deciduous forest edge and adjacent scrub around the Isthmus of Tehuantepec in Oaxaca, Mexico. It is considered a resident species within this small range rather than a long-distance migrant.

Rose-bellied Buntings forage in low vegetation and forest edge for seeds and invertebrates, generally remaining within or near forest cover. Males sing a warbling song from perches within their limited habitat. Nests are cup-shaped and placed in dense low vegetation. Because of its very restricted range, this species is one of the least commonly encountered Passerina buntings.