Penguins, squirrel monkeys and camels were just some of the animals who had their vital statistics recorded at ZSL London Zoo's 2022 annual weigh-in on Thursday.
Humboldt penguin chick Bobby, who hatched at the zoo in April, took to the scales for his first weigh-in, while aquarist Colette Gibbings dove into the Tiny Giants aquarium to measure the growth of the zoo's Critically Endangered brain coral.
Patient keepers encouraged the zoo's troop of Bolivian black-capped squirrel monkeys onto the scales one by one by offering up a few tasty treats, while Bactrian camel Noemie - the heaviest animal at the zoo - was coaxed onto her weigh-board by camel keeper Mick Tiley.
Elsewhere, Sumatran tigress Gaysha stretched out against a giant ruler, eight weeks after giving birth to three critically endangered tiger cubs.
The youngsters were the only animals not being recorded in the annual event as they will be weighed for the first time at their first health check. This check will give vets and keepers a great indication of how they're doing, although it's estimated they've already quadrupled in size since their June birth.
With more than 14,000 animals in their care, ZSL London Zoo's keepers spend hours throughout the year recording the heights and weights of all the animals - vital information which helps them to monitor their health and wellbeing.
The annual weigh-in is an opportunity for keepers at ZSL London Zoo to make sure the information they've recorded is up-to-date and accurate, with each measurement then added to the Zoological Information Management System (ZIMS), a database shared with zoos all over the world.