Formerly known as Middlesex Fells Zoo, Stone Zoo is a 26-acre park located near the Spot Pond reservoir in Stoneham, Massachusetts, and operates under the control of Zoo New England. It was founded in 1905 by Charles Price, the Metropolitan District Superintendent. In 1969, the zoo was renamed in honor of Walter D. Stone, who was director of both Stone Zoo and Franklin Park Zoo, another zoological park under the care of Zoo New England. To maintain the custody and control of both Franklin Park Zoo and Stone Zoo, the Commonwealth Zoological Corporation or CZC was organized. Later on, CZC was renamed to Zoo New England.

The Stone Zoo is actually a middle-sized zoo, only 11 hectares large, and started with only a few animal collections. Later on, the zoo began to grow and develop, and housed more exotic types of animals as well.