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:Take a number: How Many Teenage Girls Deliberately Harm Themselves? Nearly 1 in 4, Survey Finds.Uranus 'was hit by a massive object twice size of Earth that caused it to tilt'The Online Gene Test Finds a Dangerous Mutation. It May Well Be Wrong.SHOCKING new research claims ELECTRICITY to the brain could reduce VIOLENT crimeEclipse 2018: How long will the Blood Moon lunar eclipse be visible in the sky?Giant Hogweed: A Plant That Can Burn and Blind You. But Don’t Panic.