education collection. The Edge is a newly designed exhibit modeled after the pine forests of Russia for the zoo's Amur tigers. Two yards with large pools and pathways that wander over visitors' heads provide enrichment and exercise for the tigers. It opened to the public in March 2017, replacing Wolf Pack Woods, which opened in 1988. Cats elsewhere include fishing cats and clouded leopards, both in Toyota Elephant Passage. Hoofed mammals Hoofed mammals are generally housed in the center of the zoo's main circular path. Species in the hoofed mammal yards include Grevy's zebras, reticulated giraffes, Bactrian camels, okapis, yellow-backed duikers, Somali wild asses, a Vietnamese potbellied pig named Charlie, a variety of antelope species including eastern bongo, addax, lesser kudu and southern gerenuk, as well as Cape buffalo. Denver Zoo is also one of only a few zoos in the world to house a breeding herd of Przewalski's horses. Other species exhibited in the hoofed mammal yards include Abyssinian ground hornbills with the duikers, west African crowned cranes with the gerenuk, red kangaroos and emus, as well as African wild dogs. Giraffe House was created in 1966 and, along with the outdoor giraffe run, houses the zoo's giraffe herd. Mountain Sheep Habitat was opened in 1979. It contains two natural-style "mountains" housing Rocky Mountain bighorn sheep and mountain goats. Birds The original aviary currently houses the bald eagle and Andean condor, and an attached building is the winter quarters for American and Chilean flamingos. Lorikeet Adventure, the Nurture Trail, and the Avian Propagation Center all opened in 2006. Lorikeet Adventure is a large, open-air mesh tent where visitors can mingle with and feed a variety of lorikeet species such as rainbow, scarlet-breasted and coconut lorikeets; it is also the home of a blue-streaked lory, the only typical lory in the exhibit. The Nurture Trail is a short trail through a forested glade home to two exhibits: one for red-crowned cranes and one for grey crowned cranes. The trail then goes past smaller outdoor enclosures attached to the Avian Propagation Center, which provides Denver Zoo with state-of-the-art facilities for breeding and raising all types of birds. The Forest Aviary in Primate Panorama is a area richly landscaped and enclosed in a nearly invisible wire mesh. Visitors can walk around inside with the birds, which include (depending on the season) the Egyptian vulture and waldrapp ibis as well as a wide