Registration closed. This field trip is full. Join another morning walk to the marsh for residents and possibly early migrating shorebirds. Bring a spotting scope if you have one. Most of our walk will be on preserve limestone and earthen trails; wear appropriate shoes and clothing. Meet at the visitor parking lot on the north side of Mack Rd., located between Winfield Rd. and Rt. 59 in Warrenville.Leaders: Kathy and Steve Mineck