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Season 23, episode 5. Keep your place, move between servers, and stay ready for the next episode.
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Hammerhead
Profile of the hammerhead shark, which has until now been shrouded in mystery as no-one could understand why its head is such a strange shape, or how it might help the creature's survival. Marine biologists in Hawaii explain how the fish utilises the unusual shape to give it a unique, deadly weapon in the oceans. Narrated by Ian Holm
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Episode 1: Cheetahs: Fast Track to Freedom
Episode 2: Norfolk Broads: The Fall and Rise of a Great Swamp
Episode 3: Typhoon Island
Episode 4: Mississippi: Tales of the Last River Rat
Episode 5: Hammerhead
Now playing
Episode 6: The Wild Wood
Episode 7: Andes: The Dragon's Back
Episode 8: Land of the Falling Lakes
Episode 9: Echo of the Elephants - The Final Chapter?
Episode 10: Shark Coast
Episode 11: Serengeti 24
Episode 12: Secrets of the Maya Underworld
Episode 13: A Boy Among Polar Bears
Episode 14: Wolf Pack