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Sloths now a days have long hair that is infested with green algae. The sloth and the green algae have a symbiotic relationship. The green algae has somewhere to grow and the sloth has some green camoflauge. In the future, sloths will have less hair so they have less body heat. The green algae start to form in clumps instead of all around spreaded the body. The sloth will become bigger, will be more active, and will walk but still be somewhat nice.