15 Photos: Night Eyes at Blank Park Zoo

Kaia 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.

Ryan 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.

Taylor 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.

Kimberly 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.

William 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.

Petra 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.

Liam 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.

Brenton 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.

Jessica 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.

James 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.

Petra Koch, 6, of Cumming, trick-or-treats during Night Eyes at Blank Park Zoo in Des Moines, Iowa, Thursday, Oct. 15, 2015.

Seven-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.

Zoey 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.