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As temperatures at the safari park soar, so too do pulses on Penguin Island, because a love triangle has emerged between Peaches, Rihanna and 'two-timer' Redley. Keepers are desperate for chicks so want a happy couple to emerge from the heartache, but sadly one poor penguin will be left on the shelf.

Kate Humble and Ben Fogle come face to face with the park's three male gorillas for the first time, and Jean Johansson attempts to stay dry as she oversees bathtime for three emus.

Six thousand miles away at the Lewa Conservancy in northern Kenya, a group of keepers conduct vital research into animals in their care. Polly chances upon a herd of wild zebra and discovers they are among the most threatened species in Africa.