Linked from
The 27 pages that link to Commensalism, each with the reason it gives.
EpiphyteRelated: Epiphytes typically gain support while leaving their host largely unaffected.
RodentiaRelated: House mice and rats exploit human environments and food stores.
Black ratRelated: Human settlements provide food and shelter that benefit black rats.
MuridaeRelated: House mice and rats can benefit from human settlements and their food stores.
DromiidaeRelated: Carried sponges may gain transport without clear harm to the crab.