This was actually a demonstration put on by the park to show visitors why they shouldn't bring those things into the park. If you want really funny, watch the Top Gear episode where they made their own convertable then drove it through an animal park. Good times.

That's nothing. In the summer of 1977 or 78, after years of human-war had decimated their habitat, baboons went on a bloody rampage in which they attacked, killed, and ate villagers.

Well there goes the neighborhood.