The world's smartest pig, owned by a mathematics teacher in Madison, WI, memorized the multiplication tables up to 12.
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Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
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There’s a bonobo named Kanzi who has learned to build a campfire and cook his own food.
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Awarding people money for doing well in IQ tests causes them to score better, $10 increased people's score by an average of more than 20 IQ points. IQ tests don’t just measure intelligence - they also measure effort.
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In 1996, research found that having excessive body hair is linked to higher intelligence.
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Poor eyesight (myopia) is associated with higher IQ.
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People who are more likeable and attractive are generally perceived as more intelligent. This is called the “Halo Effect.”
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