four stories high and cover more than an acre of ground. Inside these tents, primates like ring-tailed lemurs, Wolf's guenons, black-and-white colobus, red-crowned mangabeys, siamangs and black-handed spider monkeys can play and climb on twisting vines. Western lowland gorillas roam freely, climbing ropes and taking afternoon hammock naps in one of the largest gorilla habitats in the world. Sumatran orangutans have their own outdoor habitat where they can climb trees and swing in hammocks. Jewels of the Emerald Forest pavilion is situated near the entrance to Primate Panorama. It features a meandering trail through diorama replicas exhibiting many small primates amongst other rainforest animals. Animals housed here include the aye-aye, pale-headed saki and golden lion tamarin. Connecting to the building is an island exhibit that's home to red-ruffed lemurs. The nearby Shamba offers a view of a Central West African village and is home to red river hogs and mandrills. An aviary further down the trail showcases rhinoceros hornbills. Monkey Island was built in 1937 with funds from the Works Progress Administration. It was rehabilitated in 1950. During the warmer months, it is inhabited by hooded capuchins. It is surrounded by a moat that also houses some aquatic birds, including white pelicans, in the summer. The moat is drained in the winter and the monkeys are housed in the Monkey House. Monkey House, facing Monkey Island, was the original primate exhibit in the zoo and still serves as the winter residence for the capuchins. Cats Predator Ridge, completed in 2004 and the first exhibit most visitors encounter, is a large exhibit representing the African savanna. It has the ability to rotate multiple groups of Southern African lions and spotted hyenas, whose overlapping scents provide environmental enrichment for the animals. Other small African animals like dwarf crocodiles and leopard tortoises are exhibited in and around the Pahali Ya Simba pavilion. A habitat for African penguins, featuring a 10,000 gallon pool with underwater viewing, was completed in 2021 and is located directly inside the front entrance. Feline House was built in 1964. In its heyday, lions, tigers, jaguars, cheetahs, Amur leopards, snow leopards, striped hyenas, fossa, red pandas, dwarf mongooses, maned wolves, northern tree shrews and bat-eared foxes called the building home. Much of the building is now closed and has been renovated in some areas to make way for Stingray Cove as well as exercise yards for animals in the zoo's