Pigs can breathe through their butts. So can mice and rats!
Scientists discovered this by researching alternative methods for ventilators traditionally used to pump oxygen to the lungs.
Turns out, oxygen gas via the anus into the intestines worked in reoxygenating blood.
Read the research in “Ventilating the rectum to support respiration” >> https://www.eurekalert.org/news-releases/809010