The gorilla team are forced to call in the vets for Alfie when it seems an abscess could signify something more sinister. But how do you sedate a 150kg gorilla? And what do you do when he struggles to come around from the anaesthetic? Tragedy strikes Penguin Island once again as a chick is orphaned and then forced to overcome a life-changing disability. Meanwhile, Jean Johansson finds out just how much the baby meerkats have grown when she tries to catch them. Jean also helps to feed the hand-reared wallaby joey and finds out why climbing a tree won't save you from a lion