The white stork (Ciconia ciconia) was hunted to extinction in Britain approximately 600 years ago. A reintroduction programme led by the White Stork Project and centred at Knepp Estate in West Sussex has been working since 2016 to re-establish a breeding population. This initiative represents one of the most significant raptor and large bird reintroductions in modern British history.
Biology and Ecology
White storks are large wading birds standing approximately 1m tall with a wingspan of 155–215cm. They are migratory, wintering in sub-Saharan Africa and breeding in Europe. Their diet consists of large invertebrates, frogs, small mammals, lizards, and fish — requiring open habitats with diverse prey availability. Storks are colonial nesters, traditionally nesting on buildings, chimneys, and large trees in European villages.
The UK Reintroduction Programme
Young storks sourced from Poland and other European sources are housed in a large pre-release aviary at Knepp, where they are fed, habituated to the environment, and wing-tagged for tracking. After release, birds are free to disperse but many return to the release site for nesting. Knepp's rewilding habitat — with diverse grassland, wetland, and scrub — provides ideal stork foraging habitat. The first confirmed wild breeding since extinction occurred at Knepp in 2020.
Welfare Considerations in Reintroduction
- Captive holding and transport from European source populations requires careful welfare management — stress reduction during capture and transport
- Wing-tagging enables individual tracking but must be fitted correctly to avoid discomfort or flight impairment
- Released birds sometimes suffer collisions with power lines — a leading cause of stork mortality across Europe; power line modification or marking where storks regularly cross reduces mortality
- Poisoning from pesticide-contaminated prey in agricultural areas is a welfare concern; organic and low-input farming areas like Knepp provide safer foraging environments
Population Progress
The UK population has grown from the original release birds to include multiple breeding pairs, with some birds dispersing to other sites across southern England. Long-term success depends on continued releases, sufficient breeding habitat, and mitigation of mortality from power lines and illegal persecution. The project monitors all wing-tagged individuals via satellite and reports annual productivity and survival data.