The Philadelphia Zoo, located in Philidelphia, Pennsylvania, on the west bank of the Schuylkill River, was the first zoo in the United States. Chartered by the Commonwealth of Pennsylvania on March 21, 1859, its opening was delayed by the American Civil War until July 1, 1874. It opened with 1,000 animals and an admission price of 25 cents.
The Philadelphia Zoo is one of the premier zoos in the world for breeding animals that have been found difficult to breed in captivity. The zoo also works with many groups around the world to protect the natural habitats of the animals in their care.