An alarmed Impala herd alerts to danger in the Serengeti National Park, Tanzania

An alarmed Impala herd alerts to danger in the Serengeti National Park, Tanzania

Frans Lanting/Corbis ©

An alarmed Impala herd alerts to danger in the Serengeti National Park, Tanzania

An alarmed Impala herd alerts to danger in the Serengeti National Park, Tanzania

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