Bobolink

Overview

The Bobolink is a distinctive grassland songbird best known for the breeding male's bold reversed pattern: black below with a pale straw-colored nape and white patches above, unlike almost any other North American songbird. Females and nonbreeding males instead look like large, buffy sparrows, making seasonal plumage change dramatic in this species. Bobolinks undertake one of the longest migrations of any songbird, traveling between North American breeding grounds and South American wintering grasslands.

Feather Identification

• Breeding male body feathers: Black underparts and face, contrasting with a pale buffy-yellow nape and white scapular and rump patches
• Nonbreeding/female feathers: Buffy yellow overall with dark streaking on the back, crown, and flanks, resembling a large sparrow
• Tail feathers: Pointed, spiky tips typical of the blackbird family, used for probing
• Size: Smaller and more compact than most blackbirds
• Similar species: Breeding males are unmistakable; nonbreeding birds can resemble large sparrows but show a distinctive pointed tail feather shape and buffier overall tone

Plumage Details

Breeding males show a striking black-and-white reversed pattern with a buffy-yellow nape, described as looking like a tuxedo worn backward. Females and nonbreeding males (including males after their post-breeding molt) show a much plainer buffy-yellow plumage with dark streaking on the back and crown, resembling an oversized sparrow. Males undergo a complete molt after breeding, transitioning to this cryptic nonbreeding plumage before migrating south, then molt again before returning north in breeding dress.

Habitat & Range

Bobolinks breed in grasslands, hayfields, and prairies across the northern United States and southern Canada. They undertake one of the longest migrations of any songbird, wintering in grassland habitats of South America, particularly in Argentina, Bolivia, and Paraguay.

Behavior & Field Notes

Bobolinks forage on the ground and in grass for seeds and insects, often in loose flocks outside the breeding season. Males deliver a bubbling, mechanical-sounding song during aerial display flights over breeding territories. Nests are cup-shaped and built on the ground, hidden in dense grass. The species' round-trip migration between North and South America covers a remarkable distance each year.