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I only know dogs and humans sneeze... so do other mammals sneeze as well? Is it possibly an evolutionarily-determined immunological trigger?

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    $\begingroup$ Are you really asking about all animals (including jellyfish for example) or rather about mammals, as your examples imply? $\endgroup$ – Arsak Jun 28 '18 at 17:15
  • $\begingroup$ Dogs and cats sneeze. My dog sneezes of excitement every morning when we're going out. A sponge - having no nose - obviously does not sneeze. $\endgroup$ – Remi.b Jun 28 '18 at 19:36
  • $\begingroup$ @Marzipanherz Yes, I’m asking about all animals. I know about humans and dogs (examples of mammals) hence why I asked if “other animals sneeze as well”. $\endgroup$ – P. SN Jun 28 '18 at 19:39
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    $\begingroup$ @P.SN Note that to a biologist, "animals" is quite a broad taxonomic grouping, and as Marzipanherz and Remi.b point out includes plenty of organisms that have no lungs or nose or respiratory system at all. $\endgroup$ – Bryan Krause Jun 28 '18 at 19:48
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    $\begingroup$ @DanHall I never doubted the question was reasonable- On the contrary, I find it very interesting. I just wanted to make sure that there is no misunderstanding due to the potential different use of the term animal by a beginner and an expert. I used to believe that this what comments are meant for. $\endgroup$ – Arsak Jun 29 '18 at 8:39
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This national geographic post discusses many mammals that sneeze. It doesn't come right out and say all, but suggests most mammals have a cough and sneeze reflex:

Mammal coughs and sneezes come from throat and nasal passages, respectively, says Bill Milsom, a comparative physiologist at the University of British Columbia.

Mammals, he says, are the only animals that process food in the mouth by chewing. In other types of animals, like reptiles, "food is swallowed whole or by chewing, and breathing is suspended during the event."

The same expert discusses non-mammals that sneeze, marine iguanas and fish.

You don't even need nerves or muscles to sneeze, per this Cell Press article

Sponges 'sneeze' without the benefit of nerves or muscles

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