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8. Dogs

Dog owners know that their dogs understand more than simple commands. They also respond to how their owners feel and to language. Cognition researchers at Barnard and Yale agree that what makes dogs among the smartest animals on earth is the way they understand humans. Through evolution, breeding, and close contact, dogs are extremely responsive to gestures, eye movements, and tones of voice. Most adult dogs understand about as many words as a three-year-old.

Dog on an agility hurdle cunfek / Getty Images

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