Ciconia ciconia
Largely unmistakable. Huge, almost all white, bird with black flight feathers, long red legs and bill. Juveniles with dark bill tip and pale legs. Easily told from Black Stork in flight by all white underparts, including wing coverts. Only flight feathers black. Wing pattern similar to White Pelican and Egyptian Vulture. Often soars high in flocks like raptors.
Mostly silent. Loud, modulated bill-clattering from both sexes is heard during courtship/display.
Wikipedia: map (se also Xeno-canto below)
Birdlife ecology