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Swinhoe's Egret Egretta eulophotes
The Swinhoe's (Chinese) Egret has yellow feet, the same as the Little and Snowy. Colour-wise this does meet the criteria for Great Egret but the proportions are wrong, the neck appears too short and thick, and it looks more like an Intermediate Egret, which would be out of range but not impossible. Two possibilities come to mind, it could be in a zoo or park where anything can and does turn up, or the poster could have the wrong location, ie: he/she lives in Serbia but took the photo elsewhere. Perhaps the poster can elaborate. Many posters fail to check the map for correct location when typing in place names as it defaults to the first occurrence of that name in the database.