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A train caboose stands at a halt on the tracks that run through Cosley Zoo.

A train caboose stands at a halt on the tracks that run through Cosley Zoo.


Cosley Zoo has a vibrant history, one that demonstrates our continued dedication to recreation, education, and wildlife conservation.

A Timeline of Our History

November 9, 1973: 2.65 acres of land were donated by Paula Jones to the Wheaton Park District. Ms. Jones wanted to save the land from development, and donated it in memory of Harvey Cosley, the previous landowner and a close relative (after whom the zoo is named).

August 17, 1974: The park—then called Cosley Children’s Park and Museum—opened on August 17, 1974. On opening day the park displayed a handful of domestic farm animals. Within a few short months, the park began exhibiting native wildlife. After about two years of operation, the park changed its name to Cosley Animal Farm and Museum.

November, 1974: An 1800s barn, now called the Taylor Barn, was moved from St. John’s Lutheran Church in downtown Wheaton to the park.

1975: Railroad tracks were laid in front of the train station and a retired Burlington railroad caboose was brought in to sit on the tracks.

September, 1976: Federal revenue sharing funds made it possible to enlarge Cosley by two acres. This area was eventually expanded into habitats for wildlife.

1982: The park built an aviary to house 13 varieties of pheasants as well as Ruffed Grouse, Doves and several other birds. Today, the aviary houses native birds and turtles.

August, 1986: With money coming in from successful fund-raising, the Wheaton Park District organized a support group called the Cosley Foundation to utilize the funds for capital developments. The Cosley Foundation, Inc. is officially recognized as a 501(C)3 not for profit foundation. Since its inception, The Cosley Foundation has consistently raised $130,000 to $150,000 annually. The foundation has sponsored the construction of the Vern Kiebler Learning Center, a 66,000 gallon duck pond, an amphitheater, and exhibits for Red Foxes, coyotes, raccoons, rabbits, White-tailed Deer and raptors.

October, 1987: The Vern Kiebler Learning Center was completed. This $356,000 facility was built to house most of the domestic farm animals, and to provide feed storage areas, hospital and isolation rooms, and office space. It also includes a large indoor area for educational programs and special events. With the construction of the barn in 1987, the zoo could be kept open year-round.

1993: A complete renovation of the wildlife area began, eliminating concrete and wire cages and providing more natural habitats.

1999: As Cosley Animal Farm and Museum grew and changed, our name no longer clearly depicted what the public thought of our facility. In conjunction with our 25th anniversary in 1999, the Cosley staff and Wheaton Park District board of commissioners decided unanimously to change the name to Cosley Zoo.

2000: Cosley Zoo pursued accreditation by the Association of Zoos & Aquariums (AZA). After completion of a very extensive application process, Cosley Zoo received official accreditation from AZA in March of 2000. Accreditation confirms that Cosley Zoo meets the high standards put forth by this organization. Accreditation must be renewed every five years.

2000: Cosley Zoo became partners with the Forest Preserve District of DuPage County in the Blanding’s Turtle Recovery Project. This project was developed to repopulate the Illinois threatened Blanding’s Turtle in DuPage County. The zoo’s primary responsibility is the rearing of turtles for release.

2000: Cosley Zoo zookeeping staff began working with a consultant to establish an operant conditioning training program for the zoo’s animals. Keeper staff is now able to perform many animal husbandry tasks with no stress or danger to either the animal or the keepers.

2000: A large addition to the train station was completed, providing a larger gift shop, additional washrooms, and new concessions.

2003: The Cosley Foundation began a new capital campaign to fund River Otter and Bobcat exhibits. The campaign was kicked off by a generous donation of $250,000 contributed by Jan Kiebler. The zoo was able to utilize this contribution for a successful matching campaign. Funds are still being raised to support these exhibits.

2006: Cosley Zoo became involved in another conservation partnership to benefit the Illinois endangered Barn Owl. Several facilities including the Forest Preserve District of DuPage County, City of Itasca’s Springbrook Nature Center, McHenry County Conservation District, and Cosley Zoo are working to hatch, rear and release these unique and beneficial birds of prey.

2008: Cosley Zoo worked with an Eagle Scout candidate to change the caboose from an empty shell to an interactive educational experience. The exhibit “Making Tracks through Illinois” focuses on native habitats and the animals found in them.

2009: The zoo expanded their parking lot from 55 to 80 spaces. To ensure a minimal environmental impact, rain gardens were added and permeable pavers were utilized for the new lot.

2010: Thanks to the fundraising efforts of the Cosley Foundation, Cosley Zoo was able to replace the pig and poultry exhibits that were originally constructed in the mid–1970’s. These new exhibits provide updated homes for both the pigs and the chickens and new facilities for the rabbits and an on-site clinic.

2011: A stormwater detention area was created to accommodate any storm water run-off for all future anticipated construction projects at the zoo. The area along the south side of the zoo was cleared and graded to ensure proper drainage, then planted with native plants that help to improve water quality.


Aviary Renovations
The Aviary received a much-needed exterior restoration. These renovations included the construction of new, larger outdoor exhibits and a new roof. Additionally, the outdoor exhibits were enhanced to include ponds, new furniture

[including: logs, rockwork, branches for perching] and plants for various species of birds to utilize. These exhibits were reconfigured to offer three large exhibits, one each for songbirds, game birds and wetland birds.

Amphitheater Relocation
The amphitheater had been located in the northwest corner of the zoo since its construction in 1997. In 2012, the amphitheater was relocated to the zoo’s front lawn in order to accommodate the space needed to build the bobcat exhibit and make it easier for guests to locate. The revamped amphitheater includes additional seating and a larger stage.

Butterfly Garden
Thanks to a very generous private donation, Cosley Zoo was able to create a beautiful butterfly garden, located across from the deer exhibit on the north side of the zoo. This area contains: native plants that are ideal for attracting butterflies, a water feature, signage, and a pathway to make the garden more accessible for visitors.

Blanding’s Turtle Conservation Area
In order to improve the space for the turtles and make working with them more efficient, a new home was completed for the releasable Blanding’s Turtles in the Vern Kiebler Learning Center. This new space provides the environment necessary for Cosley Zoo to rear 75-150 turtles each year. It also features four cameras which provide guests with a live view of the turtles.

Bobcat Exhibit
The construction of the highly anticipated bobcat exhibit was completed in the fall. The project was funded by the Cosley Foundation, Inc. with the support of a grant from the Illinois Department of Natural Resources Capital Museum Grants Program. The exhibit is approximately 1,000 square feet in size and features more than 25 feet of vertical space. Additionally, it includes: intricate rockwork containing a heated area, a water feature, plants, and logs suitable for the cats to exercise their natural ability to climb and explore.

FrogWatch USA
In April 2012, Cosley Zoo officially began a FrogWatch USA Chapter and held its first training session. This exciting partnership with AZA’s FrogWatch USA gives the general public an amazing opportunity to participate in important scientific research, while learning about our local amphibian populations, and contributing to amphibian and wetland conservation. Through this hands-on citizen science program, and with the help of Cosley Zoo staff, volunteers learn to identify local frog and toad species by their calls during the breeding season. Volunteers then go out in the field to gather data that is added to the FrogWatch USA database. Ongoing analyses of this data have been used to help develop practical strategies for the conservation of frog and toad species throughout the United States. With the creation of the Cosley Zoo Chapter, the future may be a little brighter for the amphibians in Illinois.