Young impala bucks spar in a test of strength in the grasslands of Serengeti National Park, Tanzania

Young impala bucks spar in a test of strength in the grasslands of Serengeti National Park, Tanzania

Joe McDonald/Corbis ©

Young impala bucks spar in a test of strength in the grasslands of Serengeti National Park, Tanzania

Young impala bucks spar in a test of strength in the grasslands of Serengeti National Park, Tanzania

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