Pelican

If it's plumage was white streaked with gray, then it's probably a young Dalmatian. All other white pelicans are pure white on their heads and necks., except for the Philippians pelican, which doesn't migrate.

The only native pelican in this area is the Dalmatian pelican (http://en.wikipedia.org/wiki/Dalmatian_Pelican), but if you saw it in a zoo or wildlife park it could be something else.

That definitely looks like a pelican to me, but I don't know what species