Conservationists say there is more room in the United States for the return of "America's Big Cat" and only surviving member of the genus Panthera than previously estimated. The US Fish & Wildlife Service reported in 2018 that there was only enough suitable habitat along the border for six jaguars to roam. Now a group of scientists write in Conservation Science and Practice that there is enough habitat in central Arizona and New Mexico spanning 2 million acres so that 90-150 jaguars could be reintroduced. Surviving jaguar ppopulations in Mexico are unlikely to repopulate the US border region due to human interference and habitat loss in this century. So reintroduction to the more northerly portion of their former range is the way forward to increasing their numbers in the USA. This area was not considered by the USFWS in their 2018 recovery plan study. The jaguar, once common in the southwest before extermination mostly by government hunters, is on the Endangered Species list. Their ancestors crossed the Beringian land bridge milenia ago and lived in the central mountains of Arizona and Mexico long before the white man occupied the land.The central mountains of this region are well populated with prey animals and suitable vegetation. Water, all important in this arid zone is also available. Given its latitiude and elevation the vast region could prove to be a snctuary for the species in an age of climate change. A recent reintroduction effort has met with success in Argentina where only 200 jaguars remain in the wild. Seventy years after their extermination, jaguars will return to the protected Iberá wetlands as part of a rewilding program. As a keystone species, jaguars shaped the ecosystems of our southwest canyonlands. Putting them back in their natural place is the humane thing to do.