A group of three adult lions and seven youngsters, the pride of Whipsnade Zoo, waited in line for the scales.
Ms Forsyth said: “Obviously, trying to get seven cubs to stand on weighing scales is challenging, but it allows us to monitor their growth.
“At the age they are at, everything’s exciting so it’s been very challenging for the keepers to get them to stay put, but they are working on it and they will get there.”