hey everyone. i have rescued a blue swedish duckling about 6 months ago. it has grown a ton and i still can't tell if it is a male or female. it does not have the curly tail feather but im not sure if they all have to have one in order to be a male. it also has an olivey green bill and has bright orange on its feet splashed. anyone have any idea for this particular breed??? any help is great!! thanks!!