sunset clouds spectacular delaware golden scenic bombay hook national wildlife refuge cloud geese gold migrate migration scenery serene sun sunlight sunrise sundown tranquil yellow brilliant climate dawn daybreak ecology environment formation light morning nature outdoors peaceful peace serenity winter cloudy sky mid atlantic silhouette solor atmosphere bird birds active aerial america animals animal backlit bay black canada branta canadensis color copy day early flight flock flying fly freedom full goose group horizontal journey migrating migratory motion move natural nobody north no passage together usa waterfowl dark shape outline solid profile form figure