14 pages later (including repeats due to one member not seeing half the posts and being confused)... One thing I did think of last night regarding the mom and the kid... I do wonder if she (and I am betting countless other parents) had thought (or put faith into) the zoo was safe and didn't think the kid COULD get through if the zoo had barriers- good ones. I don't think I've ever seen a parent (though am sure there are some) go to the zoo first and inspect every animal location and every barrier just to be sure their kids won't be able to jump, climb over/under, wriggle through them.
As mentioned earlier...split second, kids under the age of 5 are....little speed demons- my nephew was like that though all of us DID teach him to hold hands crossing the street or walking through the parking lot- it's still very easy for them to slip off. Zoo only had a tiny window to decide because all animals have a primal instinct in their DNA whether they are wild or 'domesticated'.