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:Life on Mars? Ethiopian volcano microbe find shows life could have THRIVED on MarsEarthquake BREAKTHROUGH: Scientists just discovered how to predict a MEGAQUAKENeptune DISCOVERY: Nightmarish ’Forbidden Planet' FOUND in hellish ‘Neptunian Desert’NASA black hole SHOCK: What happens when two supermassive black holes COLLIDE?In Turkey, Keeping Alive a Language of WhistlesI’m a Veteran Without PTSD. I Used to Think Something Was Wrong With Me.