From page 5 of the 2006 migratory bird regs. Number 5 seems to answer your question:
License Information
See page 3 for youth waterfowl hunt license exceptions on Sept. 16-17.
• License requirement. A valid hunting license is required to hunt all migratory game birds in Wisconsin. Please see resident and non-resident license options below.
• Age related regulations
1. Persons born on or after January 1, 1973, must have a hunter education certificate to purchase any hunting license.
2. Persons 12 and 13 years old must be accompanied by a parent or adult guardian (18 years or older) while hunting.
3. Persons younger than 12 years old may not hunt or purchase a hunting license.
4. Persons 12 years old and over must have hunting licenses
except 2006 Wisconsin hunter education graduates using a
hunter education certificate during the period it is valid as a small game license.
5. Persons 16 years old and older must purchase the state and federal waterfowl stamps to hunt ducks, geese or brant.