Two months after hatching, the fledgling period has ended and the duckling is now a juvenile. Between three to four months of age, the juvenile can finally begin flying as its wings are fully developed for flight (which can be confirmed by the sight of purple speculum feathers). Its bill will soon lose its dark grey coloring and its sex can finally be distinguished by three factors. The bill coloring is yellow in males, black and orange for females. The breast feathers are reddish-brown for males, brown for females. The center tail feather is curled for males (called a drake feather), straight for females.
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