Wild Animals

Sand Martin Welfare and Riverbank Erosion

The sand martin is a colonial-nesting summer visitor that excavates burrows in vertical sandy banks, with welfare challenges linked to riverbank management, flooding, and aerial insect availability.

Key Facts

Sand martins excavate burrows 40-100 cm long in sandy cliff faces for nesting
UK breeding population is around 250,000 pairs, with strong recovery since the Sahel drought collapse in the 1980s
They feed almost entirely on small flying insects, especially midges and gnats, over water
Sand martin colonies can number in the thousands and may reuse the same bank over many years
The species arrives in the UK from March, among the earliest returning summer migrants

Welfare Considerations

Sand martins are highly sensitive to riverbank management practices. Channel straightening, bank reinforcement with concrete or rock armour, and vegetation clearance destroy nesting habitat. Flooding during the breeding season can drown burrows containing eggs or chicks. Aerial insect declines due to agricultural intensification near rivers reduce food availability. Competition for burrow sites can cause significant welfare costs within large colonies.

What You Can Do

Advocate for natural riverbank management that maintains sandy vertical faces for nesting
Support river restoration projects that recreate meanders and diverse bank profiles
Create artificial sand martin banks using purpose-built structures at nature reserves
Record sand martin colonies through BTO BirdTrack to contribute to population monitoring