"Visitors can look for the young penguins this summer, once the chicks fledge and begin to explore the rugged terrain of the zoo's penguinarium, which simulates the endangered birds' native habitat along the rocky coast of Chile and Peru.A few zoo facts:The Vienna Zoo is the oldest existing zoo and was opened to the public in 1765.The United States first public zoo, Central Park Zoo, opened in 1874" . . . .