The Denver Zoo is an 80-acre zoological garden located in City Park of Denver, Colorado, United States. Founded in 1896, it is owned by the City and County of Denver and funded in part by the Scientific and Cultural Facilities District. It is the most popular paid attraction in the Denver metropolitan area. The Denver Zoo was started with the donation of an orphaned American black bear. With the construction of Bear Mountain, it became the first zoo in the United States to use naturalistic zoo enclosures rather than cages with bars. It expanded on this concept with Primate Panorama, featuring huge mesh tents and open areas for apes and monkeys, and with Predator Ridge, which has three separate areas through which animals are rotated so that their overlapping scents provide environmental enrichment.