COS's primary mission is to promote and provide recreational birding activities and educational opportunities about birds for the Chicago community.  We plan over a dozen trips per year and programs led by birding experts, both local and from around the world.

In addition to recreational birding, COS is committed to helping protect birds and their habitat in the Chicago area through conservation projects and local advocacy. We organize and participate in restoration projects to ensure birds have healthy habitats to thrive. We also share our birding observation data, so the public and scientific community can use it.  We believe that understanding where and how birds thrive in our region is integral to driving our conservation initiatives and supporting our advocacy positions.