Spring Migration – Trumpeter Swans

Spring Migration – Trumpeter Swans

Mar 9, 2021

Pushing hard on the heels of a retreating winter, migrating trumpeter swans are moving northward.  For area wildlife enthusiasts, the sight and sound of wild swans is a heart stirring event.

With peak weights exceeding thirty pounds, the trumpeter swan is North America’s largest waterfowl.  Although swans were an abundant nesting species at the time of Iowa settlement, unregulated hunting for meat and skins coupled with wholesale wetland drainage led to a rapid demise.  By the mid-1880s, swans no longer existed in the state.  Similar declines were occurring elsewhere.  By the 1930s, only 70 surviving trumpeters remained in the entire U.S.

In 1993, the DNR launched a recovery project aimed at restoring a token population of wild swans to state marshlands.  Spearheaded by Iowa wildlife biologist, Ron Andrews, the project focused on the release of captive reared youngsters [cygnets] with the goal of establishing 15 nesting pairs by 2003.  Many of those released birds survived and in 1998, the first modern-day pair of free ranging swans successfully nested in Iowa.

Today, wild trumpeters are successfully reclaiming historic and restored wetland nesting areas across the state.  During the summer of 2020, 119 nesting pairs of trumpeter swans were inventoried statewide.  Swans currently nest in 37 Iowa counties with the greatest densities occurring in Northern Iowa.