What's the point in feeding your crabs moose poop? How did you get moose poop???
It’s mostly just kind of a weird “extra” thing that’s safe for them to have & they seem to like. XD Herbivorous poop tends to have undigested or partially digested nutrients still in them, due to their digestive system & plants being tough & whatnot. So that’s the theory behind hermit crabs enjoying eating it, they’re getting those nutrients. And it’s similar to why some small animals like rodents & such will eat their own poop as well.
You can put in poop from either wild herbivores (moose, deer, sheep), or captive ones [if you know they’re fed a healthy diet & haven’t recently had medications] (rabbits, guinea pigs, I’m sure others I’m forgetting right now).
I got the moose poop from one of my favorite crabby shops - http://alaskahermit.com/shop/ They also sell dall sheep poop, which I’ve gotten for them before too.