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Yawning isn't just for humans. Here's why fish, birds and other animals yawn too, according to an expert.

CBS News
Summary
Nutrition label

77% Informative

The "evolutionarily ancient" act of yawning likely serves a few purposes, a Johns Hopkins University professor says.

Yawns have been shown to increase arousal and alertness as associated with these state changes.

Research also suggests yawning has a brain-cooling function.

VR Score

79

Informative language

78

Neutral language

59

Article tone

informal

Language

English

Language complexity

54

Offensive language

not offensive

Hate speech

not hateful

Attention-grabbing headline

not detected

Known propaganda techniques

not detected

Time-value

medium-lived

Source diversity

1

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