The corn bunting (Emberiza calandra) is Britain's largest bunting — a plain, streaky bird whose jangling, key-rattling song is the quintessential soundtrack of lowland arable farmland. Once common across Britain's cereal-growing districts, it is now red-listed, having suffered a catastrophic population decline of over 80% since the 1970s. It is among the farmland birds most severely impacted by agricultural intensification.
Habitat and Ecology
Corn buntings are specialist birds of open, extensively farmed arable and mixed farmland. They require:
- Large, open arable fields with wide, unobstructed fields of view
- Invertebrate-rich habitats for chick provisioning — cereal fields with diverse weed communities, field margins, and rough grassland
- Winter stubbles and seed-rich field margins for overwintering food
- Prominent song posts — small trees, fence posts, overhead wires — used by males throughout the breeding season
Breeding System
Corn buntings are among the most polygynous passerines — individual males may mate with several females simultaneously (up to 18 have been recorded). Females are entirely responsible for nest building, incubation, and chick rearing. Nests are built on or near the ground in cereal crops or rough grass. Early cutting of silage fields is a significant cause of nest destruction.
Causes of Decline
- Loss of winter stubbles — overwinter food supply critical for survival
- Autumn-sown cereals replacing spring crops — reduced invertebrate diversity during chick rearing
- Pesticide use suppressing insect prey — chick starvation is the primary cause of breeding failure
- Hedgerow removal reducing song post availability and field boundary diversity
- Loss of mixed farming — integrated arable/livestock systems supported higher invertebrate densities
Conservation Management
Agri-environment scheme options most beneficial to corn buntings include:
- Winter seed mixes and unharvested cereal headlands providing food through winter
- Spring-sown cereal crops with reduced pesticide use
- Thick grass field margins and set-aside providing nesting and foraging habitat
- Delayed hay and silage cutting until after 15 August
Targeted management on known corn bunting territory sites is most impactful — populations are now very localised, and conservation efforts on the right farms in the right areas are critical.