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
A man from Stevenage has spoken to ITV News Anglia about his experience of growing up with a stammer.
A quiet night, with more sunshine the next few days...
Legendary Newmarket trainer Luca Cumani has announced that he will retire at the end of this year.