San Diego Zoo

The zoo sits on 100 acres (40 ha) of land leased from the City of San Diego. It houses over 12,000 animals of more than 680 species and subspecies. It is the most visited zoo in the United States; travelers have cited it as one of the best zoos in the world.
Its parent organization, the San Diego Zoo Wildlife Alliance, is a private nonprofit conservation organization and has one of the largest zoological membership associations in the world. The San Diego Zoo Wildlife Alliance also operates the San Diego Zoo Safari Park. Provided by Wikipedia