Interesting question, Athena.  I haven't been able to find any other animal that poops as much as a rabbit, and have certainly found a lot of evidence for rabbits going a lot, so I think that it is very possible.  They can poop more than 100 little pellets a day!  The reason for this is because rabbits stomachs need to stay active in order for them to be healthy.  They could die if they don't poop for even just a day!