In December 2011, the Kovler Penguin-Seabird House, which had previously been home to rockhopper, king penguins, common murres and puffins closed down after thirty years at the zoo due to worries about the deteriorating condition of the building, prompting outcry from some Chicago residents. It was soon announced it would be replaced with a newly renovated West Gate, featuring a children's train and an all-new exhibit, Regenstein Macaque Forest, featuring Japanese macaques, or "snow monkeys", in a state-of-the-art exhibit with a hot spring, set to open in fall 2014.