In this episode, young giraffe mum Tula gives birth, while both the penguin chicks and a silvery gibbon baby must face their fears. Rothschild giraffe Tula is a week overdue after a 13-month pregnancy. But keepers are anxious that history could repeat itself - she gave birth to a stillborn calf last year. Meanwhile this year's brood of penguin chicks are about to face the ordeal of joining the main pool, where they must compete for fish with the adult penguins. Before joining the big pool, keepers have to teach the group a vital life skill - catching fish. But there is one member of the class, Squares, who just isn't mastering the basics. Baby silvery gibbon Eko is also having to learn fast. After clinging on to mum Tilu for the first six months of his life, Eko is learning how to branch out and swing between ropes for himself - 50 feet up.