Orang-utan Oshine gets weighed, having been on a strict diet since arriving from South Africa - but she is reluctant to climb on the scales and insists that Jeremy gets on too. Meanwhile, baby golden-cheeked gibbon Mikado is introduced to his new foster mother Alex and Bart proves to be a star pupil.

Staff prepare for the arrival of two new woolly monkeys from Switzerland, but they are worried how the animals will cope with the long journey - and how they will fit in once they get here. The male capuchins are put to the test with a clever puzzle feeder and the female stump-tailed macaques vie for superiority.