Redhead (Aythya americana) Science Article 2
Diets of wintering redheads (Aythya americana) have been studied in the past, but none of theprevious studies compared diets of the upper gastrointestinal tract to determine if they differeddue to sex, age, location, year, or time of year.
MICHOT, T. C et al, Acta Zoologica Academiae Scientiarum Hungaricae 54 (Suppl. 1), pp. 239-250, 2008