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Chicago Ornithological Society is a registered 501(3)(c) non-profit organization engaged in promoting the appreciation of birds.  Your membership fees and donations are tax-deductible.

Annual Membership Options

We have four membership options - Individual, Family, Senior (62+) and Student.  Choose your membership option from the drop down below and click the "Pay Now" button to pay via PayPal.

Membership Options

If you prefer, you can join by mail/check instead of the online form by printing and completing this form:  Printable Membership Form

*Membership fees can be waived in case of financial hardship.  Contact us to request a waiver.

Why Join COS?

  • Field Trips — COS hosts quality field experiences for its members and the general public. Most field trips are free! Our trips give everyone the opportunity to learn from some of the best birders in the Chicago area. We also provide field trips focused on beginning birders and sometimes can do trips in Spanish.

  • Education — COS provides education to its members and the general public about birds and threats to their habitat. COS hosts educational workshops taught by experts from around the world. Members also present bird programs for local school groups.

  • Community We provide a platform for the Chicago birding community to engage, both in person and online. This website provides information about our conservation and advocacy efforts, the latest COS news and field trip reports. The calendar shows upcoming trips, educational programs, social events, restoration work days and more. You can also find us on Facebook, Instagram and Twitter and connect with other birders there. Our members also receive a regular eNewsletter with special features and birding news.


  • Conservation — COS strives to be a strong, influential voice in promoting habitat restoration for migratory and resident birds, including actively leading efforts, such at the LaBagh Woods Project. COS reviews and assists in planning other restoration projects in the Chicago region as well.

  • Advocacy  —  We recommend appropriate action, including participating in Park Advisory Councils for parks that provide important bird habitat. We advocate for man-made structures which pose less of a threat to birds. COS is a founding member of Bird Conservation Network, a coalition of 21 organizations (Audubon chapters, bird clubs, and conservation organizations) sharing an interest in the conservation of birds.

We warmly appreciate any contributions to support our conservation and education efforts.