Donate Now to the Chicago Zoological Society
The Bison Circle recognizes those generous donors who are committed to the Chicago Zoological Society's mission—to inspire conservation leadership by connecting people with wildlife and nature—and are able to support the Society through significant gifts of $1,500 or more.

Bison Circle members truly make an impact. Through their contribution, we are able to reach millions of individuals each year, including:
  • Two million zoo guests engaged by unique exhibits and programs
  • Over 250,000 schoolchildren, campers, and families who participate in award-winning science education programs
  • Nearly 24,000 teachers who take part in our professional development workshops
  • Diverse communities across Chicagoland.
We inspire conservation action by leading by example, and Bison Circle donors are an integral part of our conservation programs. The Society is an active partner in wildlife protection programs around the world, including the Sarasota Dolphin Research Program, the world’s longest-running study of bottlenose dolphins.

We have also pioneered the field of conservation psychology, the study of how people connect with animals and nature—an endeavor that would be much more difficult without Bison Circle members.

Bison Circle donors care…and their support is critical to animal welfare. Thanks to their donations, thousands of animals representing 400 species receive state-of-the-art care through top-notch medical, husbandry, and nutrition programs. In fact, animal care technologies developed at Brookfield Zoo are employed in 165 countries.

Discover the Bison Circle giving levels and associated privileges,
or call (708) 688-8667 for more information.


Bison Circle Explorer $1,500 - 2,499
  • Free admission to all attractions and parking
  • Invitation to Bison Circle Summer Picnic and winter Holiday Magic reception
  • Opportunity for a Personal Animal Experience
  • Priority Zoo Camp registration
  • Listing in Annual Report
  • Behind-the-scenes golf cart tour
  • Discount in gift shops and zoo restaurants
  • Bison Circle access cards and 10 additional guest passes to all exhibits
Bison Circle Defender $2,500 - 4,999
  • Invitation to breakfast and tour of the zoo
  • Plus all the benefits of the Explorer membership
Bison Circle Innovator $5,000 - 9,999
  • Opportunity to participate in Sleepover Safari (overnight at the Zoo)
  • Plus all the benefits of the Defender membership
Bison Circle Researcher $10,000 - 24,999
  • Lunch and behind-the-scenes tour with the President/CEO
  • Plus all the benefits of the Innovator membership
Bison Circle Protector $25,000 or more
  • Deckside with dolphins and participating in a training session
  • Plus all the benefits of the Researcher membership

Don’t forget your employer’s matching gift program—make your support go even further!

Please note: Under IRS guidelines, the amount of your contribution that is deductible for federal income tax purposes is limited to the excess of your payment over the value of the goods or services provided by the Chicago Zoological Society. 

    For 2014 contribution, the estimated fair market value of goods or services received in return for this contribution is $159.24.
  • For 2013 contribution, the estimated fair market value of goods or services received in return for this contribution is $145.96.

If you would prefer to send in a donation by mail please send to:
Chicago Zoological Society
Brookfield Zoo
3300 Golf Road
Brookfield, IL 60513

If you would prefer to talk to someone about making a donation please call:

If you have questions about Membership please call: 708-688-8341