On the assumption you're not just trolling - have you ever actually been to a zoo? Serious question.
Animal food ends up on the floor. Human children's food does as well, frequently. Even the most civilised of us have been known to get a little gravy down our fronts at dinner.
Indeed, zoo animals' food is often presented as a scatter feed - food distributed around the substrate of the exhibit to encourage natural foraging behaviour (though the solid floor would work against that in this case).
