geese gathering marshes wild landscape

avian background biology bird birding birds circadian cold conservation cycle distance distant dry ducks ecology feathered flap flight flock flocking flying form formation frozen gamebirds gathering geese goose group habit hill hills klamath lake lower marsh migrate migrates migration migratory move national ornithology pattern reeds reflection refuge rhythm season seasonal shape shine silhouette silhouettes sky snow soar teamwork tule tules vast waterfowl wetland wetlands wild wildlife winged wings wonder