You probably don't care, but that isn't a duck. Its a Toulouse Goose.
In Gimp... First... choose the Ellipse Select tool from the toolbar...
Next, Select the eye... or eyes...
Then go to the "FILTERS" menu, choose "ENHANCE" then "RED EYE REMOVAL"...
Remember when you are finnished to go to the "SELECT" menu and choose "NONE" to un-select the eye/eyes you selected earlier.
Result... I also did an Auto White Balance on the edit...
Thank you for the help on red eye removal BusRider i appreciate that. Nice edit thanks.