The **Chicago Zoological Society** (CZS), commonly associated with Brookfield Zoo, is a private nonprofit organization that has been a cornerstone in animal care and conservation since its inception in 1921. Founded with the mission to inspire conservation leadership by connecting people with wildlife and nature, CZS operates on land owned by the Forest Preserves of Cook County[4][6]. **History and Operations**: Brookfield Zoo opened in 1934 and has since become one of the top zoos in the nation, attracting over 2.1 million visitors annually[5]. The zoo is renowned for its naturalistic habitats and groundbreaking conservation efforts, featuring over 4,300 animals across diverse species[5]. The organization also runs the Center for Animal Care and Welfare and the Center for Conservation Leadership, focusing on education, research, and community outreach[5]. **Key Achievements**: CZS has received significant funding from organizations like the MacArthur Foundation, with grants totaling over $5.8 million from 1979 to 2016[5]. The society's commitment to conservation has led to partnerships with various international organizations. **Current Status**: As a 501(c)3 organization, donations to CZS are tax-deductible, supporting its ongoing conservation and educational initiatives[1]. The organization continues to innovate in animal care and conservation, maintaining its international reputation for excellence. **Notable Aspects**: Brookfield Zoo's unique exhibits, such as the Great Bear Wilderness, offer visitors immersive experiences with nature. The zoo's emphasis on community engagement and conservation leadership positions it as a leader in the zoological community[2][4]. With its rich history and commitment to conservation, the Chicago Zoological Society remains a vital institution in promoting wildlife preservation and education.