Alarmed impalas herd alert to danger in the Serengeti National Park, Tanzania

Alarmed impalas herd alert to danger in the Serengeti National Park, Tanzania

Frans Lanting/Corbis ©

Alarmed impalas herd alert to danger in the Serengeti National Park, Tanzania

Alarmed impalas herd alert to danger in the Serengeti National Park, Tanzania

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