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Ring-tailed Lemurs sit on a measuring scale as keepers at London Zoo record animals' vital statistics at the annual weigh-in, in London, Tuesday, Aug. 19, 2025.

Video. London Zoo animals step onto scales for annual weigh-in

Updated:

From giant tortoises weighing over 200 kilos to tiny snails just a few grams, animals of every size lined up this week for London Zoo’s annual weigh-in.

Keepers recorded the weight and measurements of more than 400 animals, updating vital health data that is shared with conservationists worldwide.

Each animal, ranging from penguins and lemurs to capybaras and Galapagos tortoises, is carefully logged into the global Zoological Information Management System.

The weigh-in helps monitor growth, track pregnancies, and detect changes, providing information used not only at the zoo but also for conservation work in the wild.

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