Because the millions of buffalo that once roamed the U.S. never farted....not once.
Re Buffaloes never farting. That is why:
* They almost went extinct. They had so much gas built up inside and no place to go. That’s when someone lit a match and most of them exploded. There was one massive BBQ over the plains of America for months, and it led to the invention of BBQ sauce. Also led to the first Ribs carry out - “Buffalo Bill’s BBQ Rib Joint and Carry Out”. You won’t find this in the history books.
* The legend about the cow jumping over the moon was based on an actual story about a bloated cow who got too close to an open fire. Put it right into orbit. Then it exploded and that is why the moon is made of green cheese. Milk on the moon turns green. Every kid knows that.
Isn’t history fun?