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Watch London Zoo's animals step onto the scales for the 2020 annual weigh in. 

Each year, the animals at London Zoo are measured and weighed by their zookeepers. And it's not always an easy task!

Penguins, squirrel monkeys and camels are just some of the creatures who had their vital statistics recorded at London Zoo’s 2020 annual weigh-in.

With more than 19,000 animals in their care, London Zoo’s keepers spend hours throughout the year recording the heights and weights of all the animals - information which helps them to monitor their health and well-being.

With different personalities and temperaments to take into account, zookeepers used ingenious tactics to entice the animals to stand up and be measured; ’tricking’ penguins into walking over scales as they lined up for their morning feed and encouraging squirrel monkeys onto the scales through fun training activities.

Weigh in on the action with a trip to London Zoo - no other day will measure up!

Visit our animals at London Zoo

  • Keeper Eva Konczol weighs the Humboldt penguins at the Annual Weigh in at ZSL London Zoo
    27 August 2020

    A weighty matter

    Annual weigh-in records animals’ vital statistics at ZSL London Zoo.

  • A domestic Bacterian camel at London Zoo
    Camelus bactrianus

    Domestic Bactrian camel

    They are the only mammal to have oval red blood cells, rather than circular.

  • Humboldt penguin underwater swimming at London Zoo
    Spheniscus humboldti

    Humboldt Penguin

    Humbolt penguins are from the beaches of Peru and Chile, and can swim speeds of up to 30mph!

  • Squirrel monkey baby at London Zoo
    Saimiri boliviensis

    Black-capped squirrel monkeys

    Squirrel monkeys have the largest brain, proportionally, of all primates.

  • Book now to visit our animals at London Zoo
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