 The animals do have a preference for Bamba, the popular children's peanut-and-corn snack (though it gives the monkeys diarrhea); other common projectiles include bottles, plastic bags, and children's shoes.In 1997 a toco toucan was found dead in its cage next to pieces of avocado, a known bird toxin.In 2006 a hippopotamus died after swallowing a tennis ball tossed into its enclosure.