Squirrel monkeys, Sumatran tigers and Humboldt penguins were among the animals that had their statistics recorded at ZSL London Zoo’s 2022 annual weigh-in last week. With more than 14,000 animals in their care, ZSL London Zoo’s keepers spend hours throughout the year recording the up-to-date heights and weights of all the animals – information which helps them to monitor their health and wellbeing. The data is added to the Zoological Information Management System, a database shared with zoos all over the world that helps zookeepers to compare important information on thousands of endangered species. “We record the vital statistics of every animal at the Zoo, from the tallest giraffe to the tiniest snail,” says Daniel Simmonds, deputy animal manager. “This helps to ensure that every animal we care for is healthy, eating well, and growing at the rate they should, as weight is a key indicator of health and wellbeing – a growing waistline can also help us to detect and monitor pregnancies, which is important as many of the species at ZSL London Zoo are endangered and part of international conservation breeding programmes, including today’s Sumatran tigers and Vietnamese giant snails.” Three Sumatran tiger cubs which were born at the zoo in June will be weighed next month at their first health check – which takes place at the age of three months. For more, see www.zsl.org/zsl-london-zoo.