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Because they share 98 percent of human DNA, researchers over the years have wondered whether chimpanzees can learn human language. Apart from Planet of the Apes, chimps don't yet engage in spontaneous communication with their trainers. Take this quiz and learn about some of the fascinating things happening in this field.
With powerful jaws, massive paws and piercing claws, the leopard is built for hunting. But how can this cat possibly take down animals three times its size?