wetland waterfowl flying winter

avian biology bird birding birds canadian circadian cloudy conservation cycle distance distant ecology feathered flap flight flock flocking fly flying form formation gamebirds geese goose group habit klamath lake lower marsh migrate migrates migration migratory move national ornithology pattern reeds refuge rhythm season seasonal shape shine silhouette silhouettes sky snow snowy soar soaring strength swan teamwork tules vast waterfowl wetlands wild wildlife winged wings winter wintry wonder duck shorebird