Do animals yawn?

Humans yawn. A yawn is the action of opening the mouth wide to take a deep breath, which is usually involuntary and taken when tired or bored.

Mammals yawn. Mammals, such as dogs, cats, tigers, lions, apes, monkeys, and pigs yawn. A human is a mammal too. 

Scientists also think that birds, reptiles, and even some fish also yawn.

Photographer: Martina Nicolls

Martina Nicolls: SIMILAR BUT DIFFERENT IN THE ANIMAL KINGDOM