large flock of white birds flying across lagoon on overcast day in mangroves of Rio Lagartos, aerial

flock white birds flying lagoon overcast day mangroves rio lagartos aerial blue sky sandbar brown river water coastline wildlife river brown water mexico top down yucatan landscape biosphere natural reserve nature environment coast conservation resevoir sanctuary outdoors wilderness estuary reserve wetland wild lake marsh sand beautiful ecosystem habitat untouched no people shallow birdwatching riverbank exotic lush greenery