Credit Bureau of Land Management, U.S. Fish and Wildlife Service Environmental groups and scientists with two universities want U.S. wildlife managers to consider reintroducing jaguars to the American Southwest. In a recently published paper, they say habitat destruction, highways and existing segments of the border wall mean that natural reestablishment of the large cats north of the U.S.-Mexico boundary would be unlikely over the next century without human intervention. Jaguars are currently found in 19 countries, but biologists have said the animals have lost more than half of their historic range from South and Central America into the southwestern United States largely due to hunting and habitat loss.