Some few advanced tribes, but hardly all, in fact a small minority, have somehow gradually learned, through slow and fatal British empirical, Lockean tabula rasa trial and error, that farting can, somehow, mysteriously, witchcraft really, loose cause and effect, attract big hungry starving mangy cats, and then, somehow, help them home in on their location, as easy slow dumb defenseless yummy prey.
Countless hapless Africans have been killed due to their gas giving their location away, not only by scent, but also by sound, dual tabulae!
Although it is against their diet of mostly flatulence causing vegetation herbs and grubs, many Africans hold their farts, even though it causes terrible piles, until they are safely behind their crude primitive stockades!
There, they really cut loose, and thus many, but not all, African villages are alive with the sounds and the aromas of fresh fruity farts.
Bill Gates, and the Bill and Melinda Gates Foundation has, of course, tried to address the situation, distributing aid in the form of free Preparation H to treat only the symptoms, and greenwise healthfood store dietary supplement jungle suppositories, for use when going outside the stockade is necessary, and of course Gates Toilets within stockades so they do not have to defecate in the open as 3 billion people must do, but needless to say, they can only do so much on the ground in Africa.