so keepers will be challenged to find imaginative ways to coax the creatures on to the scales, which Ms Ryan said is part of the staff's 'enrichment'. 'Weighing the animals is enrichment for our ...

Angela Ryan, head of zoological operations at London Zoo, said the weigh-in ... Shanti were tempted onto the scales to see how they're growing PA Media All animal statistics, including Mangalista ...

"Weight is a particularly important indicator ... squirrel monkeys follow a blue ball on a stick. For larger animals, the scales are disguised as patches of grass in order to record their statistics.