geese in a frozen marsh

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