Field Trip Report: Woodcock Walk Roundup
COS President, field trip leader, and all around Timberdoodle fan gives us a roundup of COS’s 2023 spring woodcock walks.
Read More
Field Trip Report: Richard Clark Park
Field trip leader Vinod Babu recounts a recent COS field trip to Richard Clark Park.
Read More
Women's History Month: Geneva Stratton-Porter
David Hoyt writes about Gene Stratton-Porter, a turn-of-the-century writer, photographer, and naturalist COS celebrates during this Women’s History Month
Read More
Dan's Feathursday Feature: Ross's Gull
Enjoy this latest installment of Dan Lory’s Feathursday feature, in which he describes his encounter with the Ross’s Gull that showed up in Chicago earlier this month.
Read More
Women's History Month: Marian Byrnes
Read about why COS celebrates Marian Byrnes, a Southeast Side conservation activist, during this Women’s History Month.
Read More
Women's History Month: Hazel Johnson
Read about why COS celebrates Hazel Johnson, the mother of the environmental justice movement, during this Women’s History Month.
Read More
Field Trip Report: Humboldt Park
David Hoyt reports on the recent COS field trip to Humboldt Park.
Read More
COS Breaking News!
Enjoy this recap of the latest COS news for March 2023.
Read More
Field Trip Report: Indian Ridge
Field Trip leader Jake Vinsel recaps the recent Indian Ridge Marsh COS bird walk.
Read More
COS 2023 Indiana Dunes Birding Festival Guide
Read COS’s guide to this year’s Indiana Dunes Birding Festival.
Read More
Field Trip Report: Basin Blitzes
Edward Warden recaps the COS Chicago River and Calumet River Basin Blitzes held this winter.
Read More
Birding Through the Year: January/February 2023
Contributor David Hoyt brings us the latest installment of his Birding Through the Year series, sharing his thoughts on winter birding.
Read More
Introducing Tweets and Eats
COS announces a new program: Tweets & Eats!
Read More
LaBagh Woods Stewardship Update: December/January
Katy Krigbaum gives a winter update about the conservation work being completed at Labagh Woods.
Read More
COS Social Media Community Guidelines
Read Chicago Ornithological Society’s social media community guidelines.
Read More
Field Trip Report: Big Marsh and Indian Ridge
Kris Hansen reports on the bird encounters at Big Marsh and Indian Ridge Marsh during the February 4 COS field trip.
Read More
Field Trip Report: Tinley Park Area
Field trip leader Vinod Babu recaps the January 21 multi-site COS field trip in the Tinley Park area.
Read More
COS Needs You!
COS has been around for over a hundred years now, but the only way it will reach its next hundred is with people dedicated to getting it there. We need you! As an all volunteer organization, COS is only as strong as the many people who help us achieve our mission.
Read More
COS 2023 Annual Meeting Recap
Lauren Kostas recaps the highlights of the 2023 COS annual meeting.
Read More
Dan's Feathursday Feature: Belted Kingfisher
Read the latest of Dan Lory’s Thursday thoughts on birds of the Chicago region. This week’s post is about the ABA bird of the year and favorite of birders by water everywhere: the Belted Kingfisher.
Read More
