In the final episode Liz Bonnin meets the animals going to extremes to survive - from cockatoos vandalising houses in Sydney to crabs who hold anemones hostage to protect themselves.Liz journeys to see these animals in action, and reveals the surprising new science behind their behaviour. There's the sloth whose hygiene habits may help hide it from predators, the stone martens who cause millions of pounds worth of damage to cars while protecting their territories, and the chimpanzees who use bullying tactics to get to the top.Life in the wild is tough, and these animals have found ingenious ways to live to see another day.