when algae lives on a sloth it is considered
Three-toed sloth Three-toed sloths are arboreal (tree-dwelling), with a body adapted to hang by their limbs. They live high in the canopy, but descend once a week to defecate on the forest floor. Their long, coarse fur often appears greenish, not due to pigment, but to algae growing on it. Sloths' greenish color and their sluggish habits provide an effective camouflage; hanging quietly, sloths resemble a bundle of leaves. Large, curved claws help sloths to keep a strong grip on tree branches.[5]