I agree 100 percent with the importation of lions, leopards, etc. from Africa. We first need to build two fences that run the length of the border with Mexico. The southernmost fence will be 24 feet high, the northernmost fence will be 24 feet high topped with razor wire. We put all the lions and leopards inside the two fences and we immediately solve our illegal immigration problem. For those who come by sea we can lure white sharks, tiger sharks and giant squid to our coastal waters. I told my wife that ecologists, sociologists, biologists and proctologists drive me crazy.
You have a good idea with the fences, but why bother with the animals?
How about putting landmines in between the two fences instead? Oh, and make the fences, at least 100 yards apart.