At the Kaziranga Forest Trail, Basil the Indian blackbuck has an emergency procedure to remove an unusual lump on his throat. There’s plenty of drama on the chimpanzee island when former leader of the troop Austin is reintroduced to the group. But how will he get on with Marlon, the new dominant male? And at the South American House, Susan welcomes a very cute new arrival – a Goeldi’s monkey baby!