I learned something interesting from them! Between here, at the end of the wall, and the Sasabe Point of Entry, they've put in 24 "wildlife passages". They call them "cat gates" or "turtle gates." They are small partial openings in the wall, about one per mile, that allow smaller animals like bobcats, javelina, skunks, raccoons, coatimundis and desert tortoises to pass through. A bear couldn't squeeze through one. Maybe a small puma could. Only the tiniest human child could get through.
I had seen these before but had no idea what they were. I had thought they were repairs at places where smugglers had attempted to cut the wall.
Alas, I forgot to snap a phone pic.