Annual Weigh-in At London Zoo

England Europe Great Britain London London Zoo Regent's Park UK United Kingdom ZSL Zoo Zoological Society of London animal animal welfare animals annual captivity magnolia land snail measurement measuring weigh in weigh-in weighing London United Kingdom August 19 2025 zookeeper magnolia land snail photocall annual weigh-in ZSL London Zoo animal monitoring vital statistics health general well-being WIktor Szymanowicz NurPhoto animal care zookeepers snail zoological society animal health animal welfare London Zoo photography animal statistics zoo event animal conservation animal management zoo keepers animal monitoring practices zoo animals animal records animal tracking zoo photography animal documentation animal observation.