The term 'Colorful Duck' can be broken down into two crossword solutions: MALLARD (7 letters) and TEAL (4 letters). The MALLARD is a medium-sized waterfowl that is native to North America, Europe, Asia, and North Africa. It is easily recognizable by its bright green head and yellow bill. The TEAL is a small duck that is found in wetlands around the world. It is known for its distinctive blue-green plumage and white markings on its wings. Both the MALLARD and the TEAL are colorful ducks that can be seen in many parts of the world.