Yabigail Duck
From SquackleWiki
Yabigail Duck was transformed into an evil being after she ate a lot of Doomsday Bread. Her feathers turned dark red and her wings began to grow claws on the ends. Her feathers became more like scales than feathers and her beak turned black and pointed.
She is known as the "co-leader" of the Ducks of Doom.
Relevant articles:
http://squackle.com/22577/stories/hooty-mchoothoot-and-the-ducks-of-doom/