Exact location: Poseidon temple. (To me one of the dream destinations of Europe.)
Maybe they are fed by the visitors and/or the guardians of the temple, who almost certainly provide water to birds and turtles.
It's blurry i know , and i'm sorry ;), I can't tell if this is a Numenius arquata or a phaeopus (because it's blurry), but maybe the location could help.
there is a breeding colony near here