Kate Humble and Ben Fogle return to Longleat Safari Park for another spectacular summer series following the fascinating stories of the exotic animals and the keepers who look after them.Lions, tigers and wolves are all fiercely territorial and will fight off newcomers without hesitation, but when it comes to defending their patch, few creatures are more fearsome than rabbits. Keeper Gemma attempts to introduce a pair of new rabbits into the group already at the park. She begins by creating a wall down the middle of the enclosure, so all the rabbits can sense each other, but even this is not without risk. Serena, one of the largest and oldest rabbits in the group, could become overwhelmed by the situation, and there is a real risk of her suffering a heart attack.Meanwhile, Kate helps Caleb as he attempts to fire up the wild instincts of the famous lions, and Ben discovers how those same animals helped Lord Bath save Longleat House from ruin over 50 years ago.Wildlife cameraman Hamza Yassin trains his long lens on his favourite animals at the park, the gorillas. The keepers have noticed some changes in the hierarchy between the boys, but what clues can Hamza find to back up the keepers' theory? Megan McCubbin helps start a training programme for the pygmy goats and discovers how the keepers are attempting to reduce the food miles of the park's Australian koalas to zero.