Concern is growing about one of the park’s older chimps in the bachelor group, high-ranking Jestah has developed a sinister looking lump on his lip. Wildlife vet John Lewis examines Jestah, and takes a biopsy, but it will be a worrying wait until the results come back. It’s a miserable day at the park but rain doesn’t stop play at Tuan’s group of orang-utans, the outside enclosure has been filled with browse for them to enjoy. A-mei finds a sheet to protect her from the rain while big male Tuan makes an ingenious cover out of bamboo. And the pond group of woolly monkeys enjoy a puzzling new feeder while Alison goes to new heights to blow the socks off Hananya’s troop.