Great Barrier Reef

BBC Two Northern Ireland HD

4:15 PM to 5:15 PM

Tuesday 6 May

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An exploration of Australia's underwater ecosystem, one of the natural wonders of the world and the largest living structure on the planet. In the first of three programmes, marine biologist Monty Halls examines the complex form of the coral reef itself and the wildlife that lives on it, from deadly fish-hunting snails and sharks that can walk on land to fighting corals and parrotfish, which cocoon themselves every night