"It began with apes. In the 1960's and 70's, scientists taught captive chimps to use words and documented wild ones using tools and planning hunting expeditions. Then other smart mammals -- monkeys, elephants and porpoises among them -- also proved to have surprisingly "human" mental powers. And in the last few years, the circle has expanded to still other mammals and beyond."
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Raven image courtesy of US Fish & Wildlife Service
