Ornithologists have known for a long time that bird populations are fluctuating. While some species are increasing and many others remain stable, we are most concerned about the 40% of bird species that are declining. This presentation will focus on all three groups ( the increasing species, the stable, and the declining ones) and point out the many ways that we have learned this.  A major scientific paper in 2019 showed that North American bird populations alone have declined by three billion birds in the last 70 years. We'll also discuss things to help.

Bill Mueller is Director Emeritus of the Lake Michigan Bird Observatory, in Ozaukee County, Wisconsin; he retired in October, 2019. Bill has held many roles in avian ecology and conservation, including working on migratory sea ducks, the development of the MOTUS wildlife tracking system in Wisconsin, aerial insectivores in the Midwest, the second Wisconsin Atlas of Breeding Birds, and stopover ecology of migratory birds in Wisconsin.

The meeting will take place in the Tolzman Community Room at the Frank L. Weyenberg Library Of Mequon-Thiensville. Further details:  https://flwlib.events.mylibrary.digital/event?id=220708