The origin of the Cora Hartshorn Arboretum and Bird Sanctuary (CHA) goes back to a gift of land that Steward Hartshorn made to his daughter, Cora L. Hartshorn, in 1923. Cora developed the area as a place where wild things could grow without harm and where people could come to enjoy them. Cora Hartshorn died in 1958 and willed the CHA to Millburn Township. In 1961 an Arboretum Association was formed to work with the Township in order to protect the area.