Mud Hen Marsh is a popular birding spot for viewing red-headed woodpeckers and warblers.

Mud Hen Marsh is located at the intersection of Sunbury Road and Big Walnut Road. The entrance and parking lot are 100 yards west on Big Walnut Road. Mud Hen Marsh is an area of wetlands, controlled succession forest, and swamp forest. There is a short trail that leads to an observation blind. From here you can see ducks, herons, shorebirds, and warblers among other species. The exit stream goes under Big Walnut Road and the bridge is a good area to look for Prothonotary Warblers, Wood Ducks, Red-headed Woodpeckers, and Bald Eagles.

There are natural surface trails throughout the wooded and open areas and an observation blind that looks out over the meadow and pond.

Access Areas with trails include Mud Hen Marsh, Ox Bow Road, Hoover Meadows, Dustin Road, Areas L, M, and N, and Clover Field.

• over 925 acres
• vital migratory stopover for over 33 different species of shorebirds
• largest breeding population of state special concern Prothonotary Warblers in Ohio
• 1,500-foot boardwalk at Area M
• observation blind at Mud Hen Marsh
• Bald Eagles frequently observed throughout the year