If the zoo is only selling the food for the purpose of giving it to the animals,
Obviously that’s not the case. Yes, they realize that, most likely, it’s going to be given to the animals, but there is no legal or contractual requirement to do so. You could just as easily take it out of the zoo with you and they won’t care.
Especially the machines that give food out for free.
I’ve never seen one. I’m not doubting they exist, mind you – just my personal experience. In any event, I again think that you’d be free to walk out with some without a problem.
The Wolf