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Nesting normally begins in early to late April , with a peak in May . The mallard is the most common duck in North America . When the large animals ( or " megafauna " ) in an area are wiped out by sudden change , such as the appearance of humans in N America a few thousand years ago , their " niche " or place in the ecosystem is left empty , and smaller species may begin to evolve to fill it . Anna Griswold ’ s presentation about federal student aid programs has set the stage for a brief discussion of the Higher Education Act which is administered by the U.S. Department of Education and scheduled for reauthorization in 2004 . Retaliation against any person who files a complaint of discrimination , participates in an investigation , or reasonably opposes a discriminatory employment or educational practice or policy is prohibited under University policy , and by state and federal law .