The Reid Park Zoo is ony about two miles from downtown Tucson.
The Reid Park Zoo, founded in 1967, is a 17-acre city-owned and operated non-profit zoo in Tucson, Arizona. The zoo features more than 500 animals. It was unofficially established in 1965 by Gene Reid, the parks and recreation director at the time. Wikipedia
This photo of Reid Park Zoo is courtesy of TripAdvisor