In pics: annual weigh-in in ZSL London Zoo

A Sumatran tiger climbs on a height chart during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

A Sumatran tiger walks past a height chart during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

A Sumatran tiger climbs on a height chart during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

A squirrel monkey is seen during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

A squirrel monkey is seen during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

A keeper weighs a squirrel monkey during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

Three squirrel monkeys are seen during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

A keeper weighs an owl during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

A keeper weighs an owl during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

A keeper weighs an owl during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

Penguins are seen during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

A keeper weighs penguins during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

A keeper weighs a penguin during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

A keeper weighs a penguin during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

Penguins are seen during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

A keeper weighs a camel during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

A keeper weighs a camel during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

A keeper weighs a camel during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

A keeper weighs a snail during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)

A keeper weighs a snail during the annual weigh-in in ZSL London Zoo in London, Britain, Aug. 25, 2022. Animals in the ZSL London Zoo were weighed and measured on Thursday. The statistics will be shared with zoos across the world. (Xinhua/Li Ying)