Ultramarine Grosbeak

The Ultramarine Grosbeak is a South American songbird found in forest edge and secondary growth across a wide swath of the continent. Males are a deep, rich blue overall, generally darker and less patterned than many other blue buntings and grosbeaks, and are set apart by a distinctly heavy, silvery-gray bill well suited to cracking seeds. Females depart entirely from the male pattern, appearing rich brown overall without any blue.

Adult male body feathers show a deep, fairly uniform blue, sometimes appearing almost blackish in low light and only revealing its rich blue tone in better illumination, without strong contrasting wing bars or facial markings. The bill is notably large and thick for the bird's size, pale silvery-gray, contrasting against the dark blue facial feathers and serving as a key identification feature. Females are uniformly rich brown, generally unmarked, with the same heavy bill shape as males but lacking any blue coloring.

Adult males maintain deep blue plumage year-round, with color most saturated on fresh feathers after molt and slightly duller with wear. Females remain rich brown throughout the year with minimal seasonal change. Immature males typically resemble females before gradually acquiring adult blue plumage.

Ultramarine Grosbeaks inhabit forest edge, secondary growth, and shrubby clearings across a broad range in South America. The species is generally considered resident within its range rather than a long-distance migrant, favoring disturbed or edge habitats over deep, undisturbed forest interior.

This species forages in low to mid-level vegetation for seeds and invertebrates, using its heavy bill to process hard seed coats. Males sing a rich, whistled song, often from a perch within or at the edge of shrubby cover. Nests are cup-shaped, typically placed in dense vegetation. The species can be somewhat inconspicuous outside of its vocal displays, often detected first by song within edge habitat.