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Capybaras are brown and live in the rain forest. Their fur allows them to blend in with their current surroundings. In the future the rain forest might become a desert and over time the Capybaras fur will change from brown to yellow to help it blend in with the sand and protect them from predators. Other predators like large birds won’t be able to see the Capybaras because their fur would protect them against being easily visible.