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9 of the smartest animals on Earth

pig weaving through obstacle course

Photo: San Diego Shooter/Flickr

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Pigs

Pigs may be the smartest domestic animals in the world. The New York Times reports on researchers who have found that domestic pigs can use mirrors to find their food, and will try to deceive other pigs so they can "hog" more food. They also learn quickly and can do tricks ranging from jumping through hoops to playing video games with joysticks. (The pig in this photo is winding its way through an obstacle course.)