Step right up, don’t be shy, it’s weigh-in day at London Zoo!
Forget your bathroom scales, this is a spectacle where animals of every shape and size hop, slither, perch and pad their way onto the weighing stations.
Each year, the Zoo’s residents from the tiniest tree frog to the mighty Sumatran tiger take part in an annual weigh-in that’s as entertaining as it is important.
The big day is part of essential animal care, helping keepers track growth, monitor health and make sure everyone’s in tip-top condition. But it also provides some hilarious photo opportunities.
Imagine a curious capybara standing proudly on scales, or a snail on its best behaviour, as if posing for the camera. Even the penguins wait their turn, queuing up to step on the scales.
In 2025, the weigh-in promises more adorable moments than ever, as keepers coax creatures with treats, training and plenty of patience. While the animals are blissfully unaware of the fuss, visitors get a rare behind-the-scenes peek at the serious science behind those oh-so-cute snapshots.
So, grab a front-row seat because when it comes to London Zoo’s annual weigh-in, every ounce counts and every photo is pure gold!
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1. Weigh day at London Zoo
A giant hooded katydid or bush cricket is weighed during the annual weigh-in photocall event at London Zoo | AFP via Getty Images
2. Weigh day at London Zoo
A lemur assists with the weighing during the annual weigh-in photocall event at London Zoo | AFP via Getty Images
3. Weigh day at London Zoo
Penguins queue to be weighed during the annual weigh-in photocall event at London Zoo | AFP via Getty Images
4. Weigh day at London Zoo
A capybara is fed as it is weighed during the annual weigh-in photocall event at London Zoo | AFP via Getty Images