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Animals make use of various kinds of communicative methods. Male blackbirds sing to attract female ones and also to keep other blackbirds off their dwellings. Mammals in the oceans like whales, 'sing' to interact with their mates far away too. Dominating hyenas raise their fur hackles in attempts to exhibit power while submissive ones crouch their heads and 'smile' to express respects. Birds of paradise attract female partners by displaying their colorful feathers while the stripes of zebras not only enable them to recognize each other, but also divert the predator's attention in times of danger. Finally, dangerous wasps are brightly colored to warn off others while some harmless ones try to fool their predators by using the same principle.