Here are three kid-friendly ways to say it:
- Sloths look green because tiny green plants called algae grow in their fur, and this helps them hide in the trees.
- Tiny green algae live in a sloth's fur, making the sloth look like leaves so it blends in.
- Green algae grow on a sloth's fur, so the sloth looks like the leaves around it and is harder for other animals to see.