Reed Bunting

The reed bunting (Emberiza schoeniclus) is a small, streaked bunting widespread across Europe and much of temperate and northern Asia. Adults are about 14–16 cm long and usually weigh around 19 g. Breeding males have a striking black head and throat bordered by a white collar and white moustachial stripe. Females are browner and more heavily streaked, while males lose much of the crisp black-and-white appearance outside the breeding season as pale feather fringes partly cover the dark head pattern.

The species varies considerably across its large range, including in body size and bill shape. Northern and western populations generally have relatively slender bills, while some southern forms have deeper, heavier bills associated with differences in diet. Females and non-breeding males can resemble other streaked buntings; the white outer tail feathers, relatively small size and strong association with dense low vegetation are useful clues. Corn bunting (Emberiza calandra) is noticeably larger and heavier-billed and lacks the reed bunting’s contrasting white outer tail feathers.

Reed buntings are best known from reedbeds, marshes, wet meadows and lake and river margins, but they are not confined to tall reeds. They also breed in sedge beds, damp scrub, willow thickets, rough grassland and, in northern regions, open upland habitats with dense low vegetation.

Good habitat usually combines dense cover for nesting and feeding with more open patches or exposed stems and shrubs used for singing and lookout. This flexibility allows the species to occupy both extensive wetlands and much smaller patches of suitable vegetation within agricultural or upland landscapes.

The diet changes strongly with season. During spring and summer, adults take insects, spiders and other invertebrates, which are also the main food given to nestlings. Prey is picked from stems, leaves and low vegetation or taken from the ground.

In autumn and winter the birds switch largely to seeds and grain and often leave wetlands to feed on farmland, stubble, rough grassland and other seed-rich ground. A British study published in 1999 found that survival through the first year fell during the population decline of the late 1970s and early 1980s, and that changes in winter survival were sufficient to account for much of the rise and subsequent decline in numbers. The timing coincided with the spread of efficient herbicides and the loss of winter stubbles, both of which reduced the small weed and grass seeds used by reed buntings in winter.

Males sing from exposed reed stems, shrubs and other low perches. The short, simple song is used to defend a territory and attract a mate. Singing males are therefore much easier to detect than their otherwise rather secretive habits might suggest.

Outside the breeding season reed buntings become more social. They often feed and roost in loose flocks and may join finches and other buntings on farmland and wetland margins. This seasonal shift from territorial singing to flocking is one of the more conspicuous changes in their behaviour through the year.

Movement patterns vary across the range. Many western and southern populations are resident or move only short distances, while birds breeding in northern and eastern Europe and Asia are much more migratory. They move south and west in autumn, with European birds wintering in milder parts of western and southern Europe and around the Mediterranean.

The timing and distance of movements vary with latitude, weather and local food conditions. Northern birds generally leave earlier and travel farther than populations in milder parts of the range.

The female builds a well-concealed cup nest low in dense vegetation, often on or close to the ground among reeds, sedges, grasses or shrubs. A typical clutch contains four or five eggs. The female incubates for about 12–13 days, while both parents feed the chicks after hatching.

The young normally leave the nest after roughly another 12–14 days and remain dependent on the adults for a short period. One or two broods may be raised in a season.

The reed bunting is classified as least concern on the IUCN Red List. Its very large range and population keep it well outside the globally threatened categories, but important regional and local declines have occurred.

The 2025 update from the Pan-European Common Bird Monitoring Scheme, based on data through 2024, shows a 34% decline in the European breeding index from 1980 to 2024 and a further 6% decline in 2015–2024.

Local losses can be much stronger. A study published in 2024 found 161 singing males at Nordre Øyeren in southeastern Norway in 2019, 67% fewer than in comparable censuses from 1976 and 1981. Reported observations showed an almost identical local decline of 66%. Some parts of the reserve nevertheless retained territory densities similar to the earlier censuses, suggesting that local habitat conditions matter. Changes in habitat, vegetation and farming practices, especially grazing, are possible explanations, but the exact causes remain uncertain.