Kate Humble and Ben Fogle are back for another sunny summer series following the remarkable lives of the exotic animals at Longleat Safari Park, and the keepers who care for their every need.The keepers recently discovered that the mother of the wolf pack, Eliska, is pregnant. However, in today's episode, their joy turns to fear. They've spotted some very strange behaviour. Eliska is lethargic and not interested in her food. She's clearly in need of urgent attention, so the vets are called, but if the worst happens, what will be the implications for the rest of the pack?This summer, we have been following the first southern koala joey born in Europe, tracking her progress day and night as she has grown before our eyes. Today, Kate and Ben meet her to find out what she's eating, how fast she's growing and if mum and daughter are bonding.Megan McCubbin continues to discover how the team keep their animals entertained and in great condition, and as a former animal keeper herself, Megan needs no encouragement to get stuck in. Today, she's planting a lawn of grass for the southern hairy-nose wombat, and she reveals why they have cube-shaped poo. Meanwhile, wildlife cameraman Hamza Yassin uses his powerful macro lens to film the park's spiders in extraordinary detail.