Starling murmurations are one of Britain's most spectacular wildlife events, but the winter roosts that generate them face disturbance that can have significant welfare consequences for roosting birds.
Starling murmuration welfare focuses on the energy costs of disturbance to roosting birds in winter conditions. Starlings roost communally for two key benefits: shared body heat that reduces individual heat loss, and the collective early warning and confusion response (the murmuration itself) that provides predator protection. When roosts are disturbed - whether by people, fireworks, or persistent predator pressure - birds expend energy through flight that they cannot easily replace during winter when food is limited. For birds already in marginal energy balance, repeated roost disturbance can tip them into starvation. The welfare significance of roost disturbance is greatest during extended cold spells when food is scarce and energy demand is highest. Urban roost sites like Brighton Pier provide warm, secure locations that have become traditional gathering points - their disturbance or management has direct welfare consequences. The dramatic decline of starling populations makes protection of existing roosts more welfare-significant for the species as a whole, as fewer birds spread across fewer roosts creates increased vulnerability to local disruption events.