Sap rising

During the transition from winter to spring, some types of trees begin to produce large amounts of tree sap. Trees, like sugar maples, don't do this just so humans can […]

Watersmeet Woods Volunteer Workday

The Skokie River and Middle Fork of the Chicago River come together to give Watersmeet Woods its name. But Watersmeet is also a wet place with numerous special types of […]

Spring Ephemerals

Spring ephemerals are wildflowers that appear for only a few weeks each year, so you need to be alert if you're going to sneak a peek. You can find them […]

Kickapoo Woods Volunteer Workday

Help us remove woody invasive species that deplete the health of the soil, prevent native plants from thriving, and severely affect the health of the ecosystem they invade. Make sure […]

Bunker Hill North Flatwoods Volunteer Workday

This site protects a large area of one of the rarest plant communities in Illinois, known as a Northern Flatwoods. Flatwoods are found where a dense layer of clay lies […]

Blue Star Woods Volunteer Workday

Help restore habitat for plants and wildlife at this historic forest preserve. Blue Star Woods was once the site of a Civilian Conservation Corps Camp and a WWII Prisoner of […]

Amphibian breeding

By May, most amphibian species in Cook County have begun breeding. Throughout the forest preserves and beyond, toads, frogs, and salamanders spend the winter hiding under logs, in rotten wood, […]