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Lions and tigers and leopards, oh my. Learn about the felines known for their speed, sound, and predatory nature.
How fast can a cheetah run? Which big cat is the strongest climber? Read all of the big cat facts to find out.
You could win $20,000 to put it into action. Take part in the Green Effect, a new initiative from SunChips and National Geographic to inspire people to take small steps for big change.
Think your photo is the "Ultimate" winner? Submit your best in six different categories.
See how Lipton is dedicated to sustainable agriculture. View pictures from Boyd Matson's trip to Africa.
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