Annual Weigh-in At London Zoo

England Europe Giant Hooded Katydid Great Britain London London Zoo Regent's Park UK United Kingdom ZSL Zoo Zoological Society of London animal animal welfare animals annual captivity measurement measuring weigh in weigh-in weighing Giant Hooded Katydid weigh-in ZSL London Zoo London United Kingdom August 19 2025 animal health vital statistics animal monitoring well-being annual event keepers scale photocall Wiktor Szymanowicz NurPhoto animal welfare zoological data animal care insect weighing animal records zoo management London Zoo event species assessment animal observation health monitoring giant katydid zoo documentation animal statistics zoo photography UK zoo insect health wildlife conservation.