London Zoo launches its trickiest annual task-the weigh-in(1/4)

A meerkat stands on scales as zookeeper Luke Taylor poses during the annual weigh-in at London Zoo, London, Britain, August 22, 2019.(Photo/Agencies)

A zookeeper cleans a giraffe enclosure at London Zoo, London, Britain, August 22, 2019. (Photo/Agencies)

Zookeeper Martin Franklin poses as he encourages Humbolt penguins onto scales during the annual weigh-in at London Zoo, London, Britain, August 22, 2019. (Photo/Agencies)

A zebra stands beside another at London Zoo, London, Britain, August 22, 2019.(Photo/Agencies)