Trilobites: Gray Ghosts, the Last Caribou in the Lower 48 States, Are ‘Functionally Extinct’ The herd of southern mountain caribou, the last in the contiguous United States, has dwindled to three animals. Conservationists attribute the decline to development in Canada. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:Peter Grünberg, 78, Winner of an ‘iPod Nobel,’ Is Dead64 Pounds of Trash Killed a Sperm Whale in Spain, Scientists SayScientists find 'SEMI-INFINITE' trove of rare-earth materials in shock discovery in JapanThreatened: A Green-Haired Turtle That Can Breathe Through Its GenitalsScientist Behind Dolly the Sheep, a Key to Parkinson’s Research, Has the Disease HimselfMatter: All by Itself, the Humble Sweet Potato Colonized the World