The problem of slothfulness in the didactyl sloth (Choloepus hoffmanni Pet.).
D000818:Animals; D002490:Central Nervous System / Q000502:physiology; D008660:Metabolism; D009068:Movement; D009119:Muscle Contraction; D009132:Muscles / Q000502:physiology; D004490:Xenarthra / Q000502:physiology*