geese migrating flock in the sky

avian biology bird birds circadian classic compass conservation conserve cycle direction distance distant diurnal ducks ecology feathered flap flight flock flocking fly flying form formation gamebirds geese goose group habit hills migrants migrate migrates migrating migration migrators migratory move ornithology pattern reeds rhythm ross season seasonal shape silhouette sky snow soar soaring strength teamwork tules vast wildlife winged wings winter wonder