All the animals at Whipsnade Zoo in Bedfordshire, from little lemurs to enormous elephants, are being weighed and measured in an annual survey.
It's a huge task for keepers as they began the task of cataloguing each one of its 2,500 animals. The heights and weights of 200 species are being recorded.
Click below to watch a report by ITV News Anglia's Claire McGlasson
More top news
Detectives in Ipswich are appealing for help to find out how 74-year Clive Wyard suffered injuries to his head.
A chilly start with some sunshine. Turning warmer allowing the cloud to build.
A chilly night to come but dry fine and sunny tomorrow, with some fair weather cloud developing.