khacken
Contributor
After working in a few aquariums, I have seen many sharks do this. I am pretty sure it is meant more to reset their jaws in place or maybe just stretch. They do it a lot after meals. Sharks don't have the equipment (lungs, diaphragm, etc.) to sneeze. What "scientists" are you referring to?
Yep, no lungs, no sneeze as we think of it. Now maybe a whale....