Kate Humble and Ben Fogle return to Longleat Safari Park for another glorious summer series, following the incredible stories of the exotic animals and the keepers who look after them. There have been many successful newborns at the park over the years, but today we find out why breeding programmes are not always easy.

There's a race to stop one of the park's most important breeding programmes from falling apart. Last year, the park joined a red squirrel breeding programme, and they have already had babies. However, those babies are already nearly adults, they're squabbling, and they can't live together. So they need to be separated. But you can't just catch a squirrel as it's too stressful for them, so the keepers have to make a plan. With the animals' safety at stake, this is one move that can't happen soon enough, but can the keepers do it without causing serious stress to the squirrels?

Also, could it be 'maybe baby' for one of the park's most endangered species? Kate meets a new female red panda, who has been paired to breed with a male. Kate sees that there are exciting signs that she could indeed be pregnant, and she helps the keepers weigh her. Meanwhile, wildlife photographer Hamza Yassin tries to confirm whether one of the other female pandas is building a nest high up in the enclosure's tree? If so, it might be a sign that she could also be pregnant.

Elsewhere, Ben is serving dinner to a pair of cold-blooded killers, the Cuban crocodiles, and he has brought ‘Croc Cam' to capture every bite. Zoologist Megan McCubbin continues to find out how the keepers in the park keep their animals entertained and in great condition. Today, she uses her skills as a former animal keeper to muck out the park's collection of Rothschild's giraffes and help identify whether a camel has a tooth problem.

Kate Humble and Ben Fogle return to Longleat Safari Park for another glorious summer series, following the incredible stories of the exotic animals and the keepers who look after them.

The park's Amur tiger breeding programme has been a huge success, with a male and female born three years ago. The precious cubs are now almost fully grown and nearing the age when they could be separated to start their own families. Before the keeper's do this, they want to assess the male's strength and determine if he has developed enough to cope on his own should he be moved to another breeding programme. They have built a massive spring to test the cub's strength. Can the nearly grown tiger outmuscle his dad?

It's always exciting when a new species arrives at the park, but it's also a lot of work. The keepers have to do all their research and then create an environment that is specifically designed for that creature's needs. The latest addition to the park is one of the world's slowest mammals, a two-toed sloth. They have to build an enclosure to meet her exacting needs, but can they create the perfect atmosphere with the exact humidity and heat she needs? If they can't, her stomach will stop working, and she won't be able to digest food properly. Wildlife cameraman Hamza Yassin takes his chance to get some amazing close-up shots of the sloth, but it turns out that trying to film one of the slowest animals on earth isn't as easy as you'd think.

Elsewhere, Ben helps the keepers hang a swing to keep the rhesus macaques entertained, and Kate helps build an assault course for the only southern hairy-nosed wombat in Europe. Also, zoologist Megan McCubbin continues to find out how the keepers in the park keep their animals entertained and in great condition. Today, she discovers how the keepers keep their rabbits' teeth trimmed.