Winter Fish Kills Possible

Due to the severe weather of the past few months, our fisheries staff is reporting that "winter fish kills" may be possible at some Forest Preserve lakes and ponds. These kills are caused by heavy snow cover over thick ice, blocking sunlight from penetrating the water. The lack of light prevents the aquatic plants in the lake from producing oxygen. Reduced levels of dissolved oxygen in the water could result in the suffocation and death of fish. As the ice melts, the fish become more noticeable at the surface and along shorelines.

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Did You Know?

The “shamrock” is alive and well in Cook County.   If you’ve so much as opened your eyes in the days leading up to St. Patrick’s Day, you’ll be familiar with the shamrock, that iconic bright green trio of leaflets that symbolizes the Irish celebration. It’s said that St. Patrick used the plant to illustrate the Christian concept of the Holy Trinity back in the 5th century.

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Sign up for the Nature Express

Don't drive to the preserves ... Take the Nature Express!   Come to the Forest Preserves Headquarters (Cummings Square at 536 N. Harlem, River Forest, IL) by public transportation (Green Line; CTA Harlem Bus #90 or PACE Bus #307 or #305) or park in our lot and we'll get you to the preserves for three special events. Reserve tickets at the links below. Please reserve only the seats you need; up to five seats can be reserved by a family or group on the Nature Express for each event. Admission to the events and your seat on the Nature Express is FREE!

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  Celebrate Charles Darwin's birthday! Drop in and explore adaptation, fitness, natural selection and survival through activities and displays. For all ages. Free.   Saturday and Sunday, February 8 & 9  ●  10 am – 3 pm Wednesday, February 12  ●  11 am – 3 pm   Hal Tyrrell Trailside Museum 738 Thatcher Ave, River Forest 708-366-6530

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Visit two of the treasures of the Forest Preserves of Cook County