sky filled with migrating geese

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