Lazuli Bunting

The Lazuli Bunting (Passerina amoena) is a small, gem-like seed-eater native to the brushy hillsides and riparian thickets of western North America. Named for the semi-precious stone lapis lazuli due to the male's striking blue coloration, this bird is a highly anticipated summer resident for birdwatchers across its range. It belongs to the family Cardinalidae, sharing a close evolutionary relationship with the Indigo Bunting, with which it occasionally hybridizes where their ranges overlap in the Great Plains.

While breeding males are exceptionally conspicuous as they sing from prominent perches, the females are quietly elegant and far more understated. This sexually dimorphic coloring provides the nesting females with highly effective camouflage against predators in their shrubby nesting sites.

Identifying a male Lazuli Bunting is straightforward due to its distinctive color blocking:

• Male Plumage: A brilliant, intense sky-blue or lapis-blue head, throat, and upperparts. The chest features a warm, rich pumpkin-orange breast band that fades into a clean white belly. Look for two prominent white wingbars on dark wings, with the upper bar being thicker and more distinct.
• Female Plumage: Considerably more drab to aid in nesting concealment. Females are warm grayish-brown overall, with a pale buffy breast, faint or absent streaking, and two thin, buffy-white wingbars. A subtle, light blue wash can often be seen on the rump, tail, and flight feathers under good lighting conditions.
• Immature/Nonbreeding: Immature males resemble females but often show a patchy mix of blue and brown as they mature over their first year.

Similar Species

• Indigo Bunting (Passerina cyanea): The male Indigo Bunting is entirely deep blue without an orange breast or prominent white wingbars. Females are darker brown, have more noticeable breast streaking, and lack the clean, unstreaked buffy breast and distinct wingbars of the female Lazuli Bunting.
• Western Bluebird (Sialia mexicana): Although also blue and orange, bluebirds are significantly larger, possess longer wings, lack wingbars, and have a thinner, more delicate insect-eating bill.

Lazuli Buntings are birds of open, scrubby, and early-successional habitats. They thrive in areas where trees are sparse or interspersed with dense shrubbery. Key habitats include:

• Chaparral and Brushy Slopes: Dry, shrub-covered hillsides dominated by sagebrush, mountain mahogany, or scrub oak.
• Riparian Corridors: Willow thickets, dogwoods, and wild rose bushes along streams and rivers.
• Disturbed Landscapes: Post-wildfire burns, logged forests, and abandoned agricultural fields where fast-growing shrubs emerge.

Range and Migration

During the breeding season (May to August), Lazuli Buntings are found throughout western North America, extending from southern British Columbia, Alberta, and Saskatchewan south to northwestern Mexico, and east to the western edge of the Great Plains.

They are recognized as molt-migrants. Unlike many songbirds that molt on their breeding grounds before migrating, Lazuli Buntings migrate south in late summer to stopover areas in the monsoon-influenced deserts of Arizona, New Mexico, and northwestern Mexico. Here, rich in late-summer insect life, they undergo their annual feather molt before completing their journey to wintering grounds in western Mexico.

Vocalizations

Male Lazuli Buntings are persistent singers from May through July. Their song is a bright, rapid, series of high-pitched, buzzy notes, often delivered in repeating phrases (e.g., sweep-sweep, tyew-tyew, cheer-cheer, tsip-tsip). Each male typically develops a unique variation of the song, which they learn from neighboring males when they first establish breeding territories. The call is a sharp, metallic spik or clip.

Diet and Foraging

During the spring and summer breeding season, Lazuli Buntings forage actively on the ground or in low shrubs, feeding primarily on insects. Their diet includes caterpillars, beetles, grasshoppers, ants, and spiders, providing vital protein for growing chicks. In fall and winter, they transition to a seed-based diet, cracking open seeds of grasses, smartweed, and wild oats, and will readily visit backyard feeders offering white proso millet, nyjer, or sunflower seeds.

Nesting and Reproduction

Females select a nesting site concealed inside dense, low shrubs, typically within three feet of the ground. The nest is an open cup constructed of grasses, bark strips, and leaves, bound with spider silk and lined with fine grass or animal hair. The female incubates a clutch of 3 to 4 pale blue, unmarked eggs for about 12 days. The young fledge in approximately 10 to 12 days, and the pair may raise one or two broods per season.