We know that some animals, like dogs and apes, can laugh. Can an animal also have a sense of humor? Join Anthony as he discusses how Koko the Gorilla and some other animals show promising signs.

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Reconstructing the Evolution of Laughter in Great Apes and Humans
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"Human emotional expressions, such as laughter, are argued to have their origins in ancestral nonhuman primate displays."

"Laughing rats and the evolutionary antecedents of human joy?
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"One of Paul MacLean's lasting insights was the recognition that subcortical regions of the human mammalian brain contain a variety of evolved emotional systems for the governance and behavior."

Laughing Rats?: Playful Tickling Arouses High-Frequency Ultrasonic Chirping in Young Rodents
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"In this reprint of a seminal article, once considered quite controversial, the authors discuss their radical claim that rats laugh."

Ultrasonic Communication in Rats: Can Playback of 50-kHz Calls Induce Approach Behavior?
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"Rats emit distinct types of ultrasonic vocalizations, which differ depending on age, the subject's current state and environmental factors."

Tickled Apes Yield Laughter Clue
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"New research has given credence to the idea that laughter evolved in a common ancestor of the great apes and humans."

Dogs Actually Can Smile - Animalist
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Rats Laugh, but Not Like Humans
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"Once, while in a drowsy, altitude-induced delirium 35,000 feet somewhere over iceland, I groped mindlessly for the cozy blue blanket poking out beneath my seat, only to realize-to my unutterable horror-that I was in fact tugging soundly on a wriggling, sock-covered big toe."

Entry 4: Do animals have a sense of humor?
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"Right now, in a high-security research lab at Northwestern University's Falk Center for Molecular Therapeutics, scientists are tickling rats."

No Joke: Animals Laugh, Too
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"Life can be funny, and not just for humans."

Laughter in animals
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"Laughter in animals other than humans describes animal behavior which resembles human laughter."

Rats' brains are more like ours than scientists previously thought
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"Neuroscientists face a multitude of challenges in their efforts to better understand the human brain."

Drawing the Line: Science and the Case for Animal Rights
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Koko (gorilla)
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Koko is a female gorilla who, according to Francine 'Penny' Patterson, her long-term trainer, is able to understand more than 1,000 signs based on American Sign Language, and understand approximately 2,000 words of spoken English."

How Laughter Works
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"The physiological study of laughter has its own name -- gelotology."

Watch More:
Why Do Hyenas Laugh?
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TestTube Wild Card
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Animals Have Human Emotions
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