mom and cubs, giraffes, okapi and baby gorilla, along with many other endangered animals. The Denver Zoo Railroad presented by Union Pacific offers a quick trip around the zoo's carousel meadow filled with beautiful lush foliage, under the shade of 100-year-old trees. Visitors can see American and Chilean flamingos and other waterfowl just outside the Primate Panorama exhibit. Denver Zoo Railroad is the first natural gas-powered zoo train in the United States. The 4D Theater is located near the Asian hoofstock exhibits. The line visitors wait in displays artifacts, art and music celebrating central Asian culture and folktales. The Helen and Arthur E. Johnson Animal Hospital was completed in 2021 and features one of the few CT scanners on an American zoo campus as well as double the space of the previous hospital built in 1969. The Schlessman Family Foundation Visitor and Education Center has windows onto a lab, surgical suite and treatment rooms allowing visitors to watch procedures. The Gates Wildlife Conservation Education Center houses classrooms and meeting rooms for public and private (rental) use. The Wild Encounters outdoor amphitheater is designed for wildlife presentations and is located just outside the Gates Center. Education and conservation Throughout the day Denver Zoo provides educational opportunities for visitors, including the sea lion demonstration, Toyota Elephant Passage demonstration, Predator Ridge demonstration, a variety of programming at both Wildlife Plaza and the Wild Encounters amphitheater as well as many other feedings/demonstrations. Some of these are seasonal, and some (like the flamingo talk every day during the summer of 2009) showcase specific animals that have been raised at the zoo. In 2014, a paid, mobile app titled the Denver Zoo Audio Tour became available, providing zoo visitors with the ability to hear short, educational presentations about numerous zoo animals. Denver Zoo is a part of Miami University’s graduate-level Advanced Inquiry Program (AIP). The program offers a Master of Arts in Biology or Master of Arts in Teaching through online coursework and face-to-face experiential learning experiences at the Denver Zoo. Denver Zoo is part of the (American) Association of Zoos and Aquariums (AZA) Species Survival Plan for many species. As an active member of the World Association of Zoos and Aquariums (WAZA), Denver Zoo works with other zoos and aquariums around the world to respond to the global extinction crisis facing the world's frogs and other amphibians. Denver Zoo works with conservationists in Peru to