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Animation describing how a cactus stores water. Grandad Charlie, an elderly tortoise, and his grandson Sam are caught in a rain storm. They pass the time with a story about the cactus. A family of woodpeckers is blown into the desert by a storm and get lost. The desert becomes dry and very hot. A scorpion and a lizard tell the woodpeckers they need to find a cactus as they contain water and insects. Mother woodpecker finds a cactus and the family have a drink. Grandad Charlie explains that a cactus is like a big water tank holding lots of rainwater and has a waxy skin to stop the water evaporating in the sun. Woodpeckers which eat their fruit help more cacti to grow by spreading the seeds.