Sloths and Algae
The sloth is a medium sized mammal that lives in the jungles of Central and South America. They are slow moving animals that live mostly in trees.
Algae are non-flowering plants that lack true stems, roots, leaves, or vascular tissue.
The relationship between these two is that algae grows on the sloths for because it helps get the algae closer to sunlight to help produce energy for itself. This gives the sloth a camo to help blend in with the trees around it. Sloths also eat the algae.