What happen

“ Could it be that we will someday come to regard speciesism as an evil comparable to racism? If animal rightists are right, ''a crime of stupefying proportions'' is going on all around us every day, just beneath our notice. ”

— An Animal's Place - New York Times
Don't let that quote fool you – it's quite a balanced and reasonable (but really long) argument: The best I've read on the topic so far. Free-Farmed food for thought, if you'll excuse the pun.