Calm river scene with two swans, Autovía de Cantabria bridge in the background

swans river scene calm water bridge reflection lush trees aerial view drone shot serene beauty san vicente de la barquera natural scenery wildlife peaceful environment birdwatching cantabria la marisma de rubin spain european nature environmental conservation biodiversity wetlands waterfowl scenic landscape nature reserve ecological balance picturesque location wildlife habitat marshland avian species flowing currents aquatic ecosystem plant life natures mirror bird species exploratory journey bridge architecture waterway animal behavior graceful wildlife aerial videography ornithology natural habitat tranquil ambiance scenic bridge elegant swans wildlife observation reflective waters serene river water reflections sky