Readers disturbed about letter on free-roaming cats.
D000818:Animals; D000835:Animals, Wild / Q000502:physiology*; D002369:Castration / Q000662:veterinary*; D002371:Cat Diseases / Q000635:transmission; D002415:Cats / Q000502:physiology*; D006801:Humans; D011155:Population Control; D011157:Population Dynamics; D011235:Predatory Behavior; D012098:Reproduction