The deciduous hardwood forest and the Rock River provide habitat for a variety of wildlife. Nearly 175 species of birds can be observed during the year, though spring is a favorite time for observing migrating species. Bald eagles can be observed along the river during the winter months. The dominant trees of the upland forest - oaks - are bountiful at Black hawk, along with a variety of other hardwoods. Numerous wildflowers, shrubs and vines grow under their canopy. More than 30 wildflower species, including orchids (showy orchids), bloom in April and May.
Orchid

The Black Hawk Forest, a dedicated Nature Preserve, has been identified as one of the least-disturbed forests in Illinois. In addition, a small area on the southwest corner has been planted in native prairie plants.

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