Sloth

Megatherium (Creature 5), Three-Toed Sloth (Creature -1)

Sloths tend to gain a green tinge to their fur as they age, a result of a peculiar strain of mossy algae that grows only on these arboreal creatures. This algae, in turn, feeds a unique species of moth that also makes its home exclusively in sloths' fur—along with other parasites, such as beetles and cockroaches.