LIke, you see here, there'd be no anus here cause it's just the butt [ I know this conversation is silly, and It's meant as no offense.] In either case, that means that they probably have a cloaca on the front half of them, which given the way they'd have to move would still kind of be like a normal bit...but that's mostly because to me I always visualize their full body from tail tip to head just straight up and down. In short: I'm dumb and sometimes I reffer to snake cloaca as front butt?