Overview: Alison calls in a specialist eye surgeon to perform the cataract operation on Lola the chimpanzee, Mr Bray normally operates on humans so it’s a unique experience for man and ape. Only time will tell if the operation has been successful. Elsewhere in the park, young chimpanzee Thelma is a willing pupil when it comes to clicker training and baby orangutans Rieke and Bulu Mata get to explore the big kid’s playroom in the nursey for the first time.