DES MOINES15 Photos: Night Eyes at Blank Park ZooJason Back of Des Moines, carries his 18-month-old daughter Bailee while trick-or-treating during Night Eyes at Blank Park Zoo in Des Moines, Iowa, Thursday, Oct. 15, 2015.Rachel Mummey/The RegisterKaia Amundsen, 5, of Des Moines, left, waves to her mom, while riding the carousel with her dad, Chris, and sister Harper, 2, while trick-or-treating during Night Eyes at Blank Park Zoo in Des Moines, Iowa, Thursday, Oct. 15, 2015.Rachel Mummey/The RegisterRyan Bonham of Ankeny holds his 15-month-old daughter Elizabeth while trick-or-treating during Night Eyes at Blank Park Zoo in Des Moines, Iowa, Thursday, Oct. 15, 2015. Elizabeth was dressed as a Sprite from Rainbow Brite.Rachel Mummey/The RegisterTaylor Lous, 17, left, Aaron Newton, both of Des Moines, and Peyton Burns, 13, of Norwalk, take a picture at the Emerald City with Claire Luetje, 2, and her brother Carter, 4, both of Ankeny while trick-or-treating during Night Eyes at Blank Park Zoo in Des Moines, Iowa, Thursday, Oct. 15, 2015.Rachel Mummey/The RegisterKimberly Painter, 8, of Perry, gathers candy with her sister Clarissa, 10, while trick-or-treating during Night Eyes at Blank Park Zoo in Des Moines, Iowa, Thursday, Oct. 15, 2015. Kimberly was dressed as Fancy Nancy and Clarissa was Medusa.Rachel Mummey/The RegisterWilliam Vasey, 1, of Indianola, struts his stuff as a cowboy while trick-or-treating during Night Eyes at Blank Park Zoo in Des Moines, Iowa, Thursday, Oct. 15, 2015.Rachel Mummey/The RegisterPetra Koch, 6, left, and Sloan Edwards, 5, both of Cumming check out some of the big cats while trick-or-treating during Night Eyes at Blank Park Zoo in Des Moines, Iowa, Thursday, Oct. 15, 2015.Rachel Mummey/The RegisterLiam Mahoney, 4, of Des Moines, meets Clifford the Big Red Dog while trick-or-treating during Night Eyes at Blank Park Zoo in Des Moines, Iowa, Thursday, Oct. 15, 2015.Rachel Mummey/The RegisterBrenton Johnson, 3, of Des Moines, takes a break from trick-or-treating to take a picture next to a dinosaur during Night Eyes at Blank Park Zoo in Des Moines, Iowa, Thursday, Oct. 15, 2015.Rachel Mummey/The RegisterJessica Thorn, 8, of Des Moines, flaps her bat wings with her sister Emily, 10, as they trick-or-treat during Night Eyes at Blank Park Zoo in Des Moines, Iowa, Thursday, Oct. 15, 2015.Rachel Mummey/The RegisterJames Guzman, 6, of Des Moines, poses for a picture while trick-or-treating during Night Eyes at Blank Park Zoo in Des Moines, Iowa, Thursday, Oct. 15, 2015.Rachel Mummey/The RegisterPetra Koch, 6, of Cumming, trick-or-treats during Night Eyes at Blank Park Zoo in Des Moines, Iowa, Thursday, Oct. 15, 2015.Rachel Mummey/The RegisterSeven-month-old biker baby Calvin Finley, of Des Moines, gets carried by his dad Derek while trick-or-treating during Night Eyes at Blank Park Zoo in Des Moines, Iowa, Thursday, Oct. 15, 2015.Rachel Mummey/The RegisterZoey Good, 4, and Sebastian Cook, 6, both of Des Moines, trick-or-treat during Night Eyes at Blank Park Zoo in Des Moines, Iowa, Thursday, Oct. 15, 2015.Rachel Mummey/The RegisterIsabella Bieker, 4, of Des Moines, checks out some animals while trick-or-treating during Night Eyes at Blank Park Zoo in Des Moines, Iowa, Thursday, Oct. 15, 2015.Rachel Mummey/The Register