A yawn is a reflex of deep inhalation and exhalation associated with being tired, with a need to sleep, or from lack of stimulation. As we know, humans and animals alike all yawn. Scientists are still on the track of why humans yawn, and to add further interest, there are now many studies on which animals yawn and why they do so. Here, we have 15 Interesting Yawn Animal Photos
and let you tell, why you think they are yawning.