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 statistics health monitoring well-being WIktor Szymanowicz NurPhoto animal care zookeeper duties conservation animal health zoo event animal welfare zoological society photography wildlife management animal records data collection animal care routine zookeeper responsibilities animal monitoring London Zoo event wildlife conservation zoo animals animal health records zookeeper tasks.