The jaguars would be no problem biologically. But this is actually a way for them to forbid any border fence, roads, pipelines, power lines, military exercises... you name it.
This would let the environmentalists grab control of a giant swath of land.
Pointless. It’s like trying to bring back saber toothed tigers or cave bears. They’re extinct, as are the subspecies of jaguars in the SW states. Let nature run its course.
we could line the border with jaguars