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 measurement measuring ring-tail lemur weigh in weigh-in weighing London United Kingdom August 2025 ring-tail lemur weighed scale photocall annual weigh-in ZSL London Zoo zoo keepers vital statistics animal health general well-being monitoring WIktor Szymanowicz NurPhoto lemur animal care conservation wildlife zoological society animal monitoring species scale measurement animal welfare data collection zoology animal tracking health assessment wildlife management animal species animal records.