Colonial seabirds — gannets, puffins, terns, and penguins — nest in dense aggregations that make them simultaneously resilient and highly vulnerable to disturbance, disease, and prey depletion.
Colonial seabird welfare is shaped by both the benefits of colonial nesting (predator dilution, information sharing) and the risks (disease transmission in dense colonies, competition for nest sites). Human disturbance at colonies causes adult flushing, leaving eggs and chicks exposed to weather and predators — sometimes fatally. HPAI outbreaks in dense colonies can kill tens of thousands of individuals in weeks. Marine protection of foraging zones enables adequate nutrition during breeding, directly improving chick welfare outcomes.