AC360° Preview: Scientists study lemurs for insights into development of human intelligence

Editor's note: It’s easy to mistake a lemur for a cat, a squirrel, or even a dog. But these adorable critters native to Madagascar are actually some of the oldest primates on earth, predating monkeys and great apes – and their brains offer insights into how the minds of man’s earliest ancestors might have worked. At the Duke Lemur Center, home to the largest collection of captive lemurs on Earth, Randi Kaye met researcher Elizabeth Brannon, who has learned that these little animals have some powerful brains. Watch Randi Kaye's story about lemur intelligence Tuesday on AC360° beginning at 10 pm ET.