Brookfield Zoo Chicago

Brookfield Zoo Chicago is a major zoological park in Brookfield, Illinois, serving the Chicago metropolitan area. The institution occupies approximately 216 acres and houses roughly 511 animal species, although its collection and exhibit composition change over time. It is owned by the Forest Preserve District of Cook County and operated by the Chicago Zoological Society, a civic and scientific organization established in the early twentieth century. The zoo was known simply as Brookfield Zoo until 2024, when the name Brookfield Zoo Chicago was adopted to emphasize its relationship with the metropolitan region. The park developed from land donated by Edith Rockefeller McCormick, who transferred property to the Cook County Forest Preserve District in 1919 for the creation of a zoological garden. The Forest Preserve District expanded the site, while the Chicago Zoological Society was formed in 1921 to promote and support the project. Construction began after a zoo tax was approved in 1926, slowed during the Great Depression, and accelerated again in the early 1930s. Brookfield Zoo opened on July 1, 1934, and attracted more than one million visitors during its first season. By the middle of the decade, attendance had reached approximately four million visitors. The zoo became internationally recognized for exhibit design that emphasized moats, ditches, landscape barriers, and more naturalistic settings rather than conventional cage-front displays. It also became an important site for landmark introductions and exhibit innovations. Brookfield was the first zoo in the United States to display giant pandas. In the 1960s it opened what was described as the country's first fully indoor bottlenose-dolphin exhibit. Its Tropic World complex, completed in 1984, created a large indoor rainforest environment and was regarded at the time as the world's largest indoor zoo exhibit. Its public-facing offer combines animal exhibits, keeper talks, family attractions, conservation interpretation, education, food and beverage services, memberships, and seasonal programming. Major areas have included Great Bear Wilderness, Habitat Africa, Tropic World, The Living Coast, Seven Seas, Sea Lion Cove, Wild Encounters, the Hamill Family Play Zoo, and Regenstein Wolf Woods. Rather than presenting only taxonomic collections, many of the newer exhibits use geographic or ecological immersion, linking animals to habitats and conservation issues. Conservation and research are central to the Chicago Zoological Society's institutional positioning. One notable field program operates at Punta San Juan in Peru, where conservationists study South American sea lions, Humboldt penguins, Inca terns, Peruvian boobies, guanay cormorants, and gray gulls. The work includes population monitoring, environmental research, sample collection, local staffing, and beach-cleanup activities involving children. The zoo also operates veterinary, educational, and conservation-leadership functions beyond its visitor exhibits. Brookfield Zoo has also faced difficult periods and public scrutiny. Attendance declined during the 1960s before public funding enabled expansion. Animal-welfare activists protested elephant deaths in 2011, and the zoo subsequently held neither elephants nor Nile hippopotamuses, although later planning materials contemplated the possible return of both species. A 1996 incident in which a child fell into a gorilla enclosure and was protected by the gorilla Binti Jua drew worldwide attention. The zoo has closed temporarily on a small number of occasions because of severe weather, flooding, extreme cold, and the COVID-19 pandemic. In September 2023 it received a reported $40 million anonymous private gift, described as the largest private donation in its history, supporting planned expansion of its tropical-forest facilities.

Brookfield Zoo Chicago originated in a plan to establish a zoological garden within the Cook County forest-preserve system. In 1919, Edith Rockefeller McCormick donated land to the Forest Preserve District of Cook County for that purpose. The district added substantial acreage, and the Chicago Zoological Society was organized in 1921 to develop and support the project. A zoo tax approved in 1926 permitted construction to begin, although work was interrupted and slowed by financial pressures associated with the Great Depression. Building activity resumed at a faster pace in the early 1930s, allowing the park to open on July 1, 1934. The new zoo was designed as a modern alternative to older menagerie models. Its use of moats and sunken ditches reduced the visual dominance of cages and created more open relationships between visitors and animals. The approach helped the institution gain international attention. Visitor demand was immediate: more than one million people visited during the first months, and cumulative attendance reached approximately four million by 1936. Chicago cartoonist John T. McCutcheon, who led the Chicago Zoological Society from 1921 to 1948, helped oversee the zoo's construction, opening, and early administration. During the 1950s, Brookfield added a veterinary hospital, a children's zoo, and the Roosevelt Fountain. The institution encountered an attendance decline during the 1960s, but a large bond issue from the Forest Preserve District financed a new period of expansion. The zoo opened a fully indoor bottlenose-dolphin facility during that decade. It also gained historical recognition as the first United States zoo to exhibit giant pandas. One of its pandas, Su Lin, was later preserved and displayed at Chicago's Field Museum of Natural History. The most important physical development of the 1980s was Tropic World, an indoor simulated tropical rainforest designed by French architect Pierre Venoa and completed in 1984. At the time, it was described as the largest indoor zoo exhibit in the world. The complex reflected a movement toward immersive ecological presentation rather than collections organized only by animal classification. In 1996, a three-year-old child fell into an enclosure in Tropic World. Binti Jua, a female western lowland gorilla, carried and attended to the child until staff could intervene; the incident received international media coverage and became one of the zoo's most widely remembered events. In the early twenty-first century, the zoo continued to replace or supplement older facilities with habitat-based exhibits and family amenities. Projects included the Hamill Family Play Zoo, a large wolf exhibit, an interactive butterfly tent, catering pavilions, and a substantial hand-carved wooden carousel. Great Bear Wilderness opened in 2010 after a reported $27.3 million investment and provided spaces for grizzly bears, polar bears, American bison, and bald eagles. Other buildings were reorganized around environments such as African savannas, deserts, Australian landscapes, southern United States wetlands, and South American coastal ecosystems. The reptile house, one of the original 1934 buildings, closed in 2005 and was converted into the Mary Ann McLean Conservation Leadership Center. The new use placed greater emphasis on the zoo's conservation mission rather than maintaining a conventional live-animal display. The children's zoo, opened in 1953, was dismantled in 2013; the site was redeveloped as Wild Encounters, which opened in 2015. The zoo has experienced occasional weather-related closures, including closures following major rainstorms, a 2011 blizzard, severe cold in 2019, and a winter storm in 2024. The 2020 pandemic closure was the longest modern interruption. Animal welfare and collection policy have shaped the institution's later history. In 2011, the advocacy group In Defense of Animals protested deaths of African elephants at the zoo. Brookfield subsequently displayed neither elephants nor Nile hippopotamuses, although later master-planning material contemplated their possible return. The zoo's conservation work extends beyond Illinois. Through the Chicago Zoological Society, a field program at Punta San Juan in Peru studies coastal and marine species, monitors populations, collects biological information, supports local conservation employment, and organizes beach cleanups with children. In September 2023, Brookfield Zoo announced or received an anonymous private contribution reported at $40 million, its largest private gift. The funding was associated with a long-term master plan, including a proposed Tropical Forests expansion connected to Tropic World. In 2024, a Ferris wheel was installed near the east mall for the zoo's ninetieth anniversary and later returned for another season. The institution now presents itself as both a major Chicago-area visitor attraction and a conservation, research, veterinary, and education organization.

• 2024

  Brookfield Zoo Chicago branding introduced

  [1]Brookfield Zoo Chicagoen.wikipedia.org

  The zoo adopted Brookfield Zoo Chicago as its public name and marked its ninetieth anniversary with seasonal attractions.

• 2023

  Largest private gift reported

  [1]Brookfield Zoo Chicagoen.wikipedia.org

  An anonymous donor provided a reported $40 million for future development and expansion.

• 2015

  Wild Encounters opens

  [1]Brookfield Zoo Chicagoen.wikipedia.org

  A family-oriented exhibit complex opened on the former Children's Zoo site.

• 2010

  Great Bear Wilderness opens

  [1]Brookfield Zoo Chicagoen.wikipedia.org

  A major bear and North American wildlife complex opened after a reported $27.3 million development.

• 1996

  Binti Jua incident

  [1]Brookfield Zoo Chicagoen.wikipedia.org

  Gorilla Binti Jua attended to a child who fell into an enclosure, an event that received worldwide attention.

• 1984

  Tropic World completed

  [1]Brookfield Zoo Chicagoen.wikipedia.org

  The large indoor tropical-rainforest simulation opened and became a defining exhibit complex.

• 1960

  Indoor dolphin exhibit introduced

  [1]Brookfield Zoo Chicagoen.wikipedia.org

  The zoo opened the first fully indoor bottlenose-dolphin exhibit in the United States.

• 1953

  Children's Zoo opens

  [1]Brookfield Zoo Chicagoen.wikipedia.org

  A children's zoo opened in August, later remaining part of the site's family-oriented history until its redevelopment.

• 1934

  Zoo opens to the public

  [1]Brookfield Zoo Chicagoen.wikipedia.org

  Brookfield Zoo opened on July 1 and quickly attracted national and international attention.

• 1921

  Chicago Zoological Society established

  [1]Brookfield Zoo Chicagoen.wikipedia.org

  The Chicago Zoological Society was formed to support and develop the planned zoo.

• 1919

  Land donated for a zoological garden

  [1]Brookfield Zoo Chicagoen.wikipedia.org

  Edith Rockefeller McCormick donated land to the Cook County Forest Preserve District for development as a zoological garden.

A civic, conservation-oriented metropolitan zoo known for large naturalistic habitats, immersive exhibits, public education, and animal-care programs.

• Indoor habitat exhibit · 1984

  Tropic World

  A large indoor complex presenting tropical and subtropical environments through primate and other animal habitats. Completed in 1984, it was designed as an immersive rainforest simulation and became one of Brookfield Zoo's signature architectural and educational attractions. Its collection has included gorillas, orangutans, gibbons, mangabeys, tamarins, spider monkeys, capuchins, sloths, giant anteaters, and other species.

• North American habitat exhibit · 2010

  Great Bear Wilderness

  A large habitat complex focused on North American wildlife. The exhibit presents grizzly and polar bears alongside species such as American bison and bald eagles, using landscape design and interpretive material to connect animal care with wilderness conservation.

• African habitat exhibits

  Habitat Africa

  A group of African-themed habitats divided into forest and savanna settings. Animals represented across the complex have included okapis, pangolins, African wild dogs, giraffes, cranes, duikers, red river hogs, and other species. The layout emphasizes ecological relationships rather than a single taxonomic group.

• Aquatic and coastal exhibit

  The Living Coast

  An aquatic exhibit presenting marine and coastal species, including Humboldt penguins, Kemp's ridley sea turtles, leopard sharks, rays, jellyfish, seahorses, clownfish, and other animals. It supports interpretation of ocean ecosystems and conservation challenges affecting coastal wildlife.

• Marine mammal exhibit · 1960

  Seven Seas

  A marine-mammal facility centered on bottlenose dolphins. Its history reflects Brookfield Zoo's long involvement with indoor aquatic presentation and public education about marine-animal behavior and care.

• Family and interactive exhibit · 2015

  Wild Encounters

  A family-focused series of exhibits opened on the former Children's Zoo site. It has included close-up and interactive experiences involving animals such as goats, llamas, parakeets, red pandas, reindeer, and wallabies, complementing the Hamill Family Play Zoo's educational activities.

• Field conservation and research

  Punta San Juan conservation program

  A Chicago Zoological Society conservation initiative in Peru's Punta San Juan reserve. Researchers monitor marine and coastal wildlife, collect biological and environmental information, support local conservation personnel, and involve children in beach cleanups. Studied species have included Humboldt penguins, South American sea lions, Inca terns, Peruvian boobies, guanay cormorants, and gray gulls.

• 2011

  Protests over African elephant deaths

  Animal-welfare organization In Defense of Animals protested after deaths among the zoo's African elephants. The controversy contributed to scrutiny of elephant management and the institution's subsequent lack of elephants on display.

  Source

• 1996

  Child falls into gorilla enclosure

  A three-year-old child fell into a Tropic World gorilla enclosure. The gorilla Binti Jua carried and attended to the child before staff removed him. The event generated worldwide attention and debate about enclosure safety and animal behavior.

  Source

Read more

• 2023Tropical Forests expansion planning

  United States

  The zoo associated a major anonymous donation with planned expansion of Tropic World into additional indoor and outdoor tropical-forest habitats.

  Outcome. Reference material describes the project as part of the zoo's master plan, with an opening reported for July 11, 2025.

  Source
• 2013Children's Zoo redevelopment

  United States

  The former Children's Zoo site was cleared and reimagined as a contemporary family-oriented area.

  Outcome. Wild Encounters opened on the site in 2015.

  Source
• 2010Great Bear Wilderness development

  United States

  Brookfield Zoo developed a major habitat complex for bears and other North American wildlife, reinforcing its shift toward large-scale ecological immersion exhibits.

  Outcome. The exhibit opened in 2010 and became a prominent visitor and conservation-education feature.

  Source

• 2023

  Fund long-term tropical-forest expansionStrategy

  Background

  An anonymous donor provided a reported $40 million, described as the largest private gift in the zoo's history.

  Action taken

  The zoo directed the gift toward its master plan, including expanded indoor and outdoor tropical-forest facilities connected with Tropic World.

  Aftermath

  The planned development became a central element of the zoo's future capital program.

  Private donation. $40 million (2023)

  Source

• 2011

  Remove elephants from the active collectionStrategy

  Background

  Animal-welfare protests followed deaths among the zoo's African elephants.

  Action taken

  Brookfield Zoo ceased displaying elephants and also had no Nile hippopotamuses in its collection, while later planning material considered possible future returns.

  Aftermath

  The decision became part of the zoo's broader debate over collection planning, welfare, space, and conservation priorities.

  Source

• 2005

  Convert the original reptile house into a conservation centerStrategy

  Background

  The reptile house was one of the first buildings opened at the zoo in 1934, but the institution later sought to give the structure a broader conservation and leadership role.

  Action taken

  The building was closed as a live-animal reptile exhibit and converted into the Mary Ann McLean Conservation Leadership Center.

  Aftermath

  The conversion strengthened the zoo's emphasis on conservation education and institutional leadership.

  Source

1. 1Brookfield Zoo Chicagoen.wikipedia.org