flock of canada geese in flight on a cloudy sky over bare treetops

bare belgium bird birds black blue bourgoyen branta canada canadensis canopy clouds cloudy couple flanders flight flock flocking fluffy flying forest formation geese ghent goose grass green grey group head invasive large migration migratory nature neck plumage reserve sky soft species top tops tree treetops waterbirds waterfowl watrbird white wild wildlife winter wood woods