
LONDON, UNITED KINGDOM - AUGUST 19: Humboldt penguins are weighed on a scale during the photocall for the annual weigh-in at ZSL London Zoo in London, United Kingdom on August 19, 2024. Every year keepers at the London Zoo record animals' vital statistics to monitor their health and general well-being. ( Wiktor Szymanowicz - Anadolu Agency )

LONDON, UNITED KINGDOM - AUGUST 19: A Humboldt penguin is weighed on a scale during during the photocall for the annual weigh-in at ZSL London Zoo in London, United Kingdom on August 19, 2024. Every year keepers at the London Zoo record animals' vital statistics to monitor their health and general well-being. ( Wiktor Szymanowicz - Anadolu Agency )

LONDON, UNITED KINGDOM - AUGUST 19: A Humboldt penguin is weighed on a scale during during the photocall for the annual weigh-in at ZSL London Zoo in London, United Kingdom on August 19, 2024. Every year keepers at the London Zoo record animals' vital statistics to monitor their health and general well-being. ( Wiktor Szymanowicz - Anadolu Agency )

LONDON, UNITED KINGDOM - AUGUST 19: A zookeeper weighs Humboldt penguins during the photocall for the annual weigh-in at ZSL London Zoo in London, United Kingdom on August 19, 2024. Every year keepers at the London Zoo record animals' vital statistics to monitor their health and general well-being. ( Wiktor Szymanowicz - Anadolu Agency )

LONDON, UNITED KINGDOM - AUGUST 19: An Asiatic lion during the photocall for the annual weigh-in at ZSL London Zoo in London, United Kingdom on August 19, 2024. Every year keepers at the London Zoo record animals' vital statistics to monitor their health and general well-being. ( Wiktor Szymanowicz - Anadolu Agency )

LONDON, UNITED KINGDOM - AUGUST 19: An Asiatic lion during the photocall for the annual weigh-in at ZSL London Zoo in London, United Kingdom on August 19, 2024. Every year keepers at the London Zoo record animals' vital statistics to monitor their health and general well-being. ( Wiktor Szymanowicz - Anadolu Agency )

LONDON, UNITED KINGDOM - AUGUST 19: Zookeepers weigh Mangalitsa pig during the photocall for the annual weigh-in at ZSL London Zoo in London, United Kingdom on August 19, 2024. Every year keepers at the London Zoo record animals' vital statistics to monitor their health and general well-being. ( Wiktor Szymanowicz - Anadolu Agency )

LONDON, UNITED KINGDOM - AUGUST 19: A zookeeper weighs a Bactrian camel during the photocall for the annual weigh-in at ZSL London Zoo in London, United Kingdom on August 19, 2024. Every year keepers at the London Zoo record animals' vital statistics to monitor their health and general well-being. ( Wiktor Szymanowicz - Anadolu Agency )