Birds
Bobolink
Dolichonyx oryzivorus · also called bobolinks
A male bobolink rises above a hayfield in full breeding plumage, black below and pale above in a pattern that looks deliberately inverted, delivering a bubbling song before beginning a migration that will carry it roughly 20,000 kilometres to South American grassland and back.
Overview
The bobolink, Dolichonyx oryzivorus, is a grassland songbird that breeds across the northern United States and southern Canada before migrating to South America for the winter. Its reversed breeding plumage and extraordinarily long annual migration make it one of the more distinctive and well-travelled small birds of the North American grasslands.
A colour pattern that breaks the usual rule
Where most songbirds keep darker feathers on top and lighter ones below for camouflage from above, the breeding male bobolink flips the arrangement entirely, trading typical camouflage logic for a bold, unmistakable seasonal display.
Status
Least Concern — declining in many regions due to grassland habitat loss and nest destruction from hayfield mowing, though not yet a broader conservation concern.
Bobolink: common questions
Why does the bobolink's breeding plumage look backwards compared to most birds?
A breeding male bobolink displays black plumage below and pale, straw-coloured plumage above, a genuine reversal of the dark-back, light-belly pattern typical of most songbirds, a striking and unusual colour arrangement that makes the species easy to identify during the breeding season.
How far does a bobolink migrate each year?
A bobolink completes one of the longest annual migrations of any North American songbird, travelling a round trip of roughly 20,000 kilometres between grassland breeding sites in North America and wintering grounds in South America, an extraordinary distance for a bird of its small size.
Why are bobolink nests vulnerable to farming?
A bobolink builds its nest directly on the ground within grassland and hayfield habitat, a placement that leaves the nest and its eggs highly vulnerable to destruction when hayfields are mowed during the nesting season, a significant factor behind regional population declines in agricultural landscapes.
Does the male bobolink keep its bold colours year-round?
No, after the breeding season a male bobolink moults into a much plainer, streaky brown plumage closely resembling that of the female, losing its distinctive black-and-pale breeding pattern entirely until it returns the following spring.