flock of barnacle goose flying in fast speed past forest

autumn barnacle goose bird passage watching birdie birding birdlife birds flight colors colours bif branta leucopsis fall fauna feather finland flock fly flying group helsinki migratory movement fast finnish forest migration nature october ornithology outdoors rural scandinavia suomi wildlife speed takeoff trees airborne animal day lifestock fence stall avian flu influenza swarm h5n1 thick foliage afternoon