Earlier in the series, the programme celebrated the life of legendary silverback gorilla Nico, who passed away at the beginning of the year. Now Mark and Lauren travel to Germany and Spain to meet the two young male gorillas they hope will join their group in Wiltshire. But how do you make friends with a gorilla? And, crucially, will these youngsters fit in with the park's three brothers? It's keeper versus wallaby when 20 of these most athletic animals must be moved to a new enclosure, but how do you catch a wallaby who can clear your head in just one hop? A team of 30 mobilise to find out. Photographer Will Burrard-Lucas is back, but how will his remote-control buggy fair against Africa's armoured giants, the white rhino? Meanwhile, Jean Johansson feeds the endangered Rothschild giraffe due to give birth, but will the park get the long awaited girl they're hoping for?