Grey herons are one of the UK's most visible large waterbirds, successfully adapting to urban environments. Understanding their welfare needs in changing landscapes informs coexistence and conservation.
Heron welfare is shaped by both their predator-prey relationships and their vulnerability to human disturbance during colonial breeding. A heronry disturbed during the critical early nesting phase can fail entirely - birds flushing repeatedly abandon eggs and small chicks that cannot thermoregulate without adult brooding. The welfare of entire colonies is therefore determined by the willingness of landowners to protect heronries from human intrusion during sensitive periods. Individual welfare on the foraging grounds is affected by prey availability - declining frog and fish populations reduce the food security of both adult herons and their growing chicks.