pair of mating white-winged black tern birds on grassy wetlands in spring season

animal avian beak bialoskrzydla biebrza biebrzanski bill bird birdie birds black bush chlidonias color colorful conservation couple during fly flying grassy green leaf leucopterus living love marsh marshes mating moor national natural nature nesting outdoor pair park period poland portrait procreation reserve rybitwa season sex spring swamp swamps tail tern tourism travel two wetland wetlands whitewinged wild wildlife wing wings