Last week saw the annual weigh-in of animals at ZSL London Zoo and all creatures great and small took part – from the Bolivian black-capped squirrel monkeys (pictured above) to the giant Galapagos tortoises and the tiny midwife toads (both pictured below). With more than 20,000 animals in the care of the zoo, the keepers spend hours through the year recording the heights and weights of all the animals. It’s an important task – the information aids them in monitoring the health and wellbeing of all those in the zoo. “It helps to ensure that every animal we look after is healthy, eating well, and growing at the rate they should – weight is a particularly important indicator of health and wellbeing,” says the zoo’s animal manager Angela Ryan. “A growing waistline can also help us to detect and monitor pregnancies, which is so important as many of the species at ZSL London Zoo are threatened and part of international breeding programmes, including today’s Asiatic lions and big-headed turtles. By sharing information with other zoos and conservationists worldwide, we can all use this knowledge to better care for the species we’re striving to protect.” For more, see www.zsl.org.