cataract surgery on a three-year-old gorilla, Leslie. This was the park's first cataract surgery on a gorilla. In January 2021, two gorillas were reported to be the first known cases of COVID-19 transmission from humans to apes during the coronavirus pandemic. The gorillas recovered from the virus. Hidden Jungle Located in Nairobi Village, this climate-controlled indoor exhibit opened in 1993 and displays tropical African birds and insects. The entrance to the building is a simulated earthen crevasse with displays for stick insects, spiders, scorpions, insects, millipedes, lizards, and snakes. The underground segment opens up to a room representing the rainforest understory, which leads to a second room representing the canopy. On display are long-tailed paradise whydah, purple grenadier, red-crested turaco, African pygmy goose, beautiful sunbird and other birds. Hidden Jungle is the setting of the annual Butterfly Jungle event. Lion Camp Opened in October 2004, Lion Camp houses the park's six African lions, Izu, Mina, Oshana and Etosha in a exhibit. The park's two other lions, Ernest and Miss Ellen, were moved to the San Diego Zoo. One side of the enclosure is dominated by an artificial rock kopje which has a glass viewing window and heated rocks. The path continues along an acacia-studded ravine and leads to a replica observation tent. This has a smaller viewing window as well as a Land Rover for the lions to rest on. Condor Ridge Condor Ridge displays endangered North American desert wildlife. The featured species are California condors (the Wild Animal Park was the key force in the recovery effort for these birds and this is one of the only places in the world where the public can see them in captivity) and desert bighorn sheep. Other species displayed include thick-billed parrots, bald eagles, Harris's hawks, squirrels, burrowing owls, and desert tortoises. African Woods and African Outpost Formerly known as Heart of Africa, these are two of the park's major exhibits. Visitors go down a trail which replicates habitats in Africa. The exhibit begins in African Woods with scrub animals - vultures, lesser kudu, and giant eland. It then progresses to the forest (okapi, red-flanked duikers, gerenuk, steenbok, demoiselle cranes, kori bustard, and wattled cranes). The path then leads to African Outpost, which features plains animals - bontebok, warthogs, bat-eared foxes, secretary birds, yellow-billed storks, ground hornbills, cheetahs, and nyala - against a backdrop of the open-range East Africa exhibit. A central