Indigo Bunting illustration
Birdsong field guide

Indigo Bunting

Passerina cyanea

A small, vibrant songbird of the cardinal family, the Indigo Bunting is known for the male's brilliant cerulean plumage and its habit of singing from prominent perches.

What it sounds like

A lively, high-pitched series of warbling notes, often delivered in rhythmic couplets such as 'sweet-sweet, chew-chew, sweet-sweet'.

Reference call, compare with what you heard
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Rec. Pat Goltz · United StatesCC BY-NC-SAXeno-canto

Field notes

  • The male's blue color is structural rather than pigmented, caused by microscopic feather structures that refract light (Tyndall scattering).
  • They are nocturnal migrants that navigate using the stars, specifically orienting themselves relative to the North Star.
  • Males exhibit 'match-singing,' where they learn and replicate the unique song variations of neighboring males to define territorial boundaries.
  • During the breeding season, they transition from a seed-based diet to one primarily composed of insects to provide high protein for nestlings.
  • Indigo Buntings are frequent victims of Brown-headed Cowbird brood parasitism, often raising cowbird chicks at the expense of their own.
Habitat
Brushy pastures, weedy fields, and shrubby edges of deciduous forests.
Range
Breeds throughout eastern and central North America; winters in Central America and the Caribbean.

Similar & commonly confused birds

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