spring mountain waterfowl wetland gathering

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