Knot Welfare: Mass Migration and Estuarine Dependency

Knots are remarkable travellers that breed in the High Arctic and winter in vast flocks on UK estuaries. Their welfare depends on the integrity of tidal mudflat food chains.

Key Facts

Up to 320,000 knots winter on UK estuaries - one of the world's most important wintering populations
Knots breed in the High Arctic, some of the most extreme conditions on Earth
They undertake one of the longest migrations of any bird - some travel 15,000km each way
Knots feed almost entirely on small shellfish (cockles and Baltic tellin) in estuarine mud
Climate change is reducing Arctic breeding success by altering timing of invertebrate emergence
Sea-level rise threatens key intertidal feeding habitat on UK estuaries

Welfare Considerations

Knot welfare is linked to the food chain of tidal mudflats at multiple levels. A knot arriving on a UK estuary after an Arctic summer and 15,000km migration must quickly replenish fat reserves. If estuarine cockle and tellin populations are depleted by commercial harvesting or pollution, knots cannot complete their energy recovery. Disturbance that flushes massed flocks off feeding grounds multiplies the welfare impact across tens of thousands of birds simultaneously. Protecting key estuaries is a high-impact welfare intervention.

What You Can Do

Support Ramsar site and Special Protection Area designations for key knot estuaries
Advocate for shellfish harvesting limits that account for shorebird food requirements
Donate to estuarine habitat monitoring and protection programmes
Respect wardens' requests to avoid areas hosting massed wader flocks
Support WWT and RSPB climate adaptation work for coastal habitats