common terns and black-headed gulls in national park albufera, spain

iberian peninsula spain spanish valencia valenciana animal animals bird birds blackheaded gull stilt chroicocephalus ridibundus common tern europe european fauna natural nature outdoor outdoors outside pied spring sterna hirundo sunny visdief wader waders water wildlife terns gulls national park albufera prominent avian inhabitants wetlands nesting habitats presence contributes rich biodiversity ecological importance wetland waterbird marsh reflection river lake pond shore wilderness swamp waterfowl landscape