title: How do you categorize an animal's natural life span?
mesh_terms: D035661:Animal Care Committees; D000827:Animal Welfare / Q000592:standards; D000818:Animals; D000830:Animals, Laboratory; D006801:Humans; D008136:Longevity / Q000502:physiology*; D051379:Mice / Q000502:physiology*; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D010146:Pain / Q000662:veterinary*