Spotted Sandpiper (Actitis macularia) Adult, breeding plumage. Conspicuous white wing stripe showing in flight while the Solitary Sandpiper has all dark upper wings in flight. Boliver Flats Shorebird Sanctuary, Bolivar Peninsula, Galveston County, Texas, USA. Beach, mud flats, and coastal marsh. Mouth of Galveston Bay at the Gulf of Mexico.