Why is Yawning Contagious?

Yawning is a reflex involving deep inhalation and stretching of eardrums, often linked to sleepiness, tiredness, or boredom. It is contagious among humans and some animals. In animals, yawning serves various functions, such as displaying teeth in baboons or courtship in penguins. Theories suggest yawning helps release carbon dioxide, keeps animals alert, or cools the brain. Studies indicate yawning might cool the brain by increasing oxygen intake. Excessive yawning could signal fatigue, suggesting rest is needed.

What is a common reason for yawning in adults?

• Excitement

• Thirst

• Sleepiness

• Hunger

How do baboons use yawning in the wild?

• To attract mates

• To cool their brain

• To display their large canine teeth

• To signal hunger

Which animal uses yawning as part of its courtship rituals?

• Snakes

• Dogs

• Penguins

• Chimpanzees

What is one theory about the evolutionary purpose of yawning?

• To signal the need for food

• To improve hearing

• To keep animals alert in a group

• To help with digestion

According to a study, what might be a physiological reason for yawning?

• To enhance taste

• To improve vision

• To cool the brain

• To increase blood pressure