At this point in the sloth-fart discussion, it might be helpful to point out that flatulence manifests in different ways, and that it naturally happens for a number of reasons. Most commonly, as mentioned, as bacteria in our intestines and stomachs help us digest our food. But as Healthline points out, there are other things that might cause a creature to fart, so while sloths don't fart because of their slow digestion — does air ever escape from their butt? You'll just have to ask a sloth.
In 2020, NHPR a New Hampshire NPR affiliate reached out to some sloth experts to ask why sloths are the way they are in this regard. And in their response, that expert said sloths, "reabsorb the gas into their gut, and then they breath it out. So they've got like fart breath, but no farting." Interestingly, birds also don't fart for the opposite reason sloths don't: Birds intestinal tracts are short, and they poop often — no farting required!
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