Giant Galapagos tortoise aged 30 and the world's largest rodents among animals in London Zoo's annual weigh-in
London Zoo is home to 4,000 different animal species that are all weighed and measured on a regular basis to monitor their health, development and identify pregnancies.
Zookeepers use different training methods or techniques to get individual animals to step on to the scales - Priscilla was lured onto a board scale with a lettuce snack.
A pair of capybaras, Humboldt penguins, and a ring-tailed lemur troop were also among the animals to step on the scales.
Tint Darwin's frogs weighed in as one of the Zoo's smallest creatures, measuring just two centimetres in length, and under two grams in weight.
London Zoo's animal operations manager Daniel Simmonds said: 'The London Zoo Annual Weigh In is not just about numbers on a scale; regular weigh-ins help zookeepers track the health of our animals - including the capybaras, tortoises, and penguins - and genuinely help us manage the care of these animals, who play a vital role in our global conservation efforts.'
Many of the zoo's animals are trained to perch on a scale while zookeepers note down their measurements.
Meanwhile, for some, scales may be placed in doorways or disguised in their habitats, meaning the animal can be weighed without realising.
The zoo says that their weigh-in is an opportunity to ensure the information recorded for each individual is up-to-date and accurate.
Each measurement is added to the Zoological Information Management System (ZIMS), a database shared with animal carers and conservationists all over the world.
This helps experts to compare important information on thousands of endangered species.
Daniel added: 'Our animals here at London Zoo receive world-class care - and a huge part of this is our meticulous planning of their diets.
'Our zoo-tritionist ensures every animal is getting the nutrients they need, while our keepers devise ways to feed the animals that spark all of their natural instincts - keeping them fit and challenged.'
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