All animal statistics, including those of Kiwi the Capybara, will be shared with keepers across the globe
Animals at London Zoo are being checked and measured as part of its annual weigh-in day to monitor their health and wellbeing.
Zookeepers will need to coax every bird, reptile, fish and mammal - from the largest rodents in the world to the greenest katydids - to the weighing scale.
Each measurement is added to the Zoological Information Management System (ZIMS), a global database shared with animal carers and conservationists that compares important information on thousands of endangered species.
Many of the zoo's animals are trained to perch on a scale while zookeepers note down their measurements, but others will need to be tempted with a strategic snack.
Katydids are famous for their leafy green camouflage and loud mating calls
Humboldt penguins are listed as vulnerable in the wild due to threats such as climate change, overfishing and habitat disturbance.
Although the zoo houses more than 14,000 animals, the keepers will only have time to measure and log the weight of about 400 creatures.
Bolivian black-capped squirrel monkeys are native to Bolivia, Brazil and Peru
Vietnamese magnolia snails hide away in their shells as they are weighed