Wild Animals

Guillemot Welfare and Cliff Colony Stress

Common guillemots nest in some of the densest seabird colonies in the world, where welfare is shaped by food availability, predation, human disturbance, and severe weather.

Key Facts

Guillemots breed at densities of up to 70 pairs per square metre
Their pear-shaped eggs roll in a circle rather than off the cliff
Guillemot chicks leap from cliffs before they can fly, guided by their father
They moult simultaneously and become flightless for several weeks each year
UK guillemot populations have recovered after catastrophic oil spill declines
Warming seas are causing prey fish to shift northward away from UK colonies

Welfare Considerations

Guillemot welfare at colonies is shaped by the intense social competition for ledge space, which causes chronic low-level stress and injury from neighbour conflicts. During the flightless moult period, birds are entirely vulnerable to oil and predation. Starvation during poor sandeel years causes slow death for chicks and increased distress in adults that cannot cache food. Human disturbance at cliff faces can cause egg and chick falls with fatal consequences.

What You Can Do

Maintain respectful distances from cliff nesting sites in summer
Support sustainable fishing policies protecting sandeel stocks
Back RSPB colony wardens who monitor and protect nesting seabirds
Report disturbance or injury incidents at seabird colonies
Reduce plastic and oil pollution that threatens guillemots at sea