My question is how can I make difference between male and female white storks? I have made a photo to three storks, two (kid and parent) have rd bill, the other kid almost black see photo in link below.
https://plus.google.com/u/0/photos/114043667362461482276/albums/5764751419702179185/5764751536437438290?pid=5764751536437438290&oid=114043667362461482276
https://plus.google.com/u/0/photos/114043667362461482276/albums/5764751419702179185/5764751536437438290?pid=5764751536437438290&oid=114043667362461482276