Great Blue Heron Perched On The Riverbank On A Sunny Day At Blackwater National Wildlife Refuge In Maryland

great blue heron perch stand one riverbank sunny day blackwater national wildlife refuge wetland maryland flowing river stream water heron bird animal avian bird watching nature swamp bank species wind rural freshwater beak habitat countryside natural fauna grassy marsh feather breeze shore grass wildlife summer lagoon lake blackwater country behavior national prey feathers plumage environment