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Yawning is the involuntary wide opening of the mouth, a deep inhalation of air into the lungs, followed by exhalation. This intriguing behavior is not unique to humans; lions, dogs, fish and even bird hatchlings still inside their eggs yawn! What Do Scientists Say? Experiments and Theories It was once believed that yawning occurred to bring more oxygen into the body. However, when scientists observed that people continued to yawn even in rooms with abundant oxygen, they launched new investigatio