Boo at the Zoo: Princesses, mythical creatures, kid-wizards, and other costumed guests are invited to join us at our annual Halloween event, Boo at the Zoo. There’s no safer or more exciting way for families with children ages 2 to 12 to trick or treat. A ticket is required for all attendees 2 years and older. Enjoy animal encounters and festive decorations along with your tasty candy and delicious snack foods from more than 30 treat stations throughout the Zoo. Tricks optional.