I would say that, because they're aliens, maybe they don't poop? Or maybe the pilgrims bring the perfect food -- a food that can be used to its fullest, without any waste products whatsoever.
They're aliens. Aliens don't necessarily poop like we do. Witness this guy.
Equally important, an alien culture might not place the same significance or meaning on excretion; especially if microbial pathogenisis isn't as much of a problem for them, it's not hard to imagine a sentient race who defecates as nonchalantly as terrestrial horses.
Uhm, no. I'm not buying that. A culture of aliens that has reading and writing and a social order almost exactly like ours but no significance to defecation or bodily waste of any type? Even horses don't sh*t where they eat, and they may defecate where they sleep but they don't sleep lying down.
If nothing else, layering your filth in front of the wall you're trying to read blocks the writing. No, that doesn't work for me as an explanation, and there's nothing about it in text, you're extrapolating to cover for the author's gaps (which there's nothing wrong with, and in fact drives most of the discussion here, but also doesn't change my mind).
Are there no internal organs in these things? Are they not made up of cells?
It's not just that there was no poop, you see, despite the scatological implications of my colostomy bag crack. There was no snot, no mention of waste air exhaled (unless you count Gruen's constant sighs, but I figured those were meant to be emotive), no sweat, little blood, not even any tears (although maybe there was the mentioned of blurred eyes at one point?) Nothing. That's too much of a stretch for me though perhaps I'm too biologically unimaginative.
I could maybe buy that they don't poop at all...but I don't buy that they don't excrete anything at all. Gases leaving stomata all over the body, I'll buy. Waste expelled in a great gout of vomitus, I buy. Poop, I buy. Nothing ever discarded by the biological processes of a complicated enough to be sentient being? Not so much. There are some indicators that we're supposed to take these beings as automatons. Not biological. Under that circumstance I might buy the no poop, but I have other issues at that point, such as why these automatons are portrayed with human sentiments and animal motivations. Why they play, for example. Or dance. I didn't think there were enough of those non-biological markers to decide absolutely (because if I'm an automaton, why eat? frex) so either way I remain dissatisfied.
And the root of my dissatisfaction is that it seems dishonest of the author to give me this whole organism's raison d'etre of avoiding friction while playing fast and loose with the biology (or at least playing fast and loose with his explanation of the biology). Also, because it's interesting, and I want to know, and he didn't address what I wanted to know about his aliens, so I feel let down. As I said, if the crux of the story hadn't revolved around the creature's physical nature, I probably wouldn't have cared. I can think of very few Escape Pod stories where waste matter has been an explicit part of the story (ok, Acephalous Dreams has sh*t in it, IIRC, and in Jen Pelland's most recent story a guy gets so scared he messes himself, but still, those are exceptions!) and it's never bothered me in all those other stories. Just here. Because if you're going to do Natur und Geist (a theme which I love, btw), you have to be faithful about the Natur. Not just the pretty poetry sunset stuff.