“You are right! The other 3 walls look very questionable especially the back wall.”
Have you been to the SF Zoo? If you had, you would have no reason to say that, period. The back “wall” of the enclosure is a fake cave opening that leads to the inner cages, and the cats cannot climb the vertical face, even if they could jump up - puls, I think the fake rock material that covers it is meade to break away if they get at it, and, to top it off, I dimly remember them saying they had motion sensors and the razor wire that tops the back wall and sides is electrified.
Tigers have been in those grottos for over 60 years, and just NOW they notice the wall is too low?
No, I stand by my hunch that the kids created the scenario that allowd the cat to get out. All this time, with prime, tasty prey mere feet away across a sidewalk, after decades of taunting and having batteries and such thrown at them...they could get over the wall all this time? And just never bothered?
No. It does not make sense. That cat needed a reason to try for that wall, and I doubt it was because the kids had hamburger grease on their hands, or they skimped on the tiger’s lunch, or it was just grumpy and having a bad day.
That tiger had a reason, and it killed one of them. That’s my hunch.
They return to their cages for the free meals.
Amazingly in a city with a current high level consumption of LSD, cocaine and other hallucinogenic drugs this has never caused a stir ~