speckled rattlesnake: markings vary but usually harmonize with background; of southwestern Arizona and Baja California
rattlesnake: pit viper with horny segments at the end of the tail that rattle when shaken
legionnaires' disease: acute (sometimes fatal) lobar pneumonia caused by bacteria of a kind first recognized after an outbreak of the disease at an American Legion convention in Philadelphia in 1976; characterized by fever and muscle and chest pain and headache and chills and a dry cough