two black-necked swans glide gracefully across a serene pond surrounded by greenery on a calm day

swans black necked pond water nature wildlife swimming serene greenery reflections tranquil birds peaceful lake aquatic animal environment outdoor landscape calm feathers waterfowl summer habitat elegant natural scenery flora fauna biodiversity dark plants two surface behavior still scenic view adventure migratory atmosphere wetland coastal riverbank leisurely movement beauty ecosystem lovers black-necked glide gracefully surrounded day swim peacefully shimmering water#39aph39#s lush greenery