Why do we yawn? Most animals that can respirate via their mouths can also yawn. We yawn, as well as most other mammals, birds, and fish. Even human fetuses have been observed yawning in the womb. Do animals yawn because they are bored or tired? Not necessarily. It is difficult to explain why other animals yawn; for some species, it may be a way to assert dominance or signal to others, while

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