Osprey successfully introduced in southern half of Minnesota

  • Article by: VAL CUNNINGHAM
  • Updated: September 3, 2013 - 3:44 PM

Programs to reintroduce the large bird of prey in the southern half of the state have paid off.

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An adult osprey soars on long wings as it scans a lake for close-to-the-surface fish.

Photo: Jim Williams , Special to the Star Tribune

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It was time to band young osprey at Carver Park Reserve in Victoria one morning in late June. A bucket truck led the way to a tall utility pole sitting incongruously in the middle of a meadow. The truck’s boom lifted and swung over to the platform on the pole’s top, then human arms reached out for the avian cargo. Back on the ground, a slender woman hopped out of the bucket, holding a box containing a handsome bird covered in dark, gold-tipped feathers — a very young osprey.

Its parents had built their nest on the platform at the top of the pole in late April, and the youngster had hatched there in late May. The nestling’s growth had been fueled by a steady diet of fish caught by its solicitous parents, now calling uneasily high in the sky over the small crowd on the ground.

Thirty years ago we couldn’t have gathered under an osprey nest in Victoria or anywhere else in the southern half of the state. Their preferred nesting sites — tall trees around lakes — had been lost to development, and this, combined with the use of DDT (before the ban) and indiscriminate shooting (before it became illegal), meant osprey stopped breeding locally. The Three Rivers Park District set out to correct that dismal fact, beginning in 1984, with a reintroduction program whose results we were witnessing.

We were guests of the park district at this osprey banding session and naturalist Judy Voigt Englund had brought along a set of metal bands to attach to the young bird’s leg to aid in future identification. The chick was now five weeks old, too young to fly to escape the banders but with adult-sized legs, so the bands would hold.

Reversing the trend

Thinking back, I recall the early years of the reintroduction program, when I was a volunteer keeping an eye on released young osprey as they tried their wings at Lake Vadnais in Ramsey County. With the approval of federal and state agencies, osprey chicks were removed from nests in northern Minnesota, where the birds were still plentiful, and brought to the metro area. They spent the first few weeks of their new lives in protected boxes on lakeshores like Vadnais.

Another key element of the reintroduction was nesting platforms erected on poles like the one our group visited in June. The reintroduction effort has continued for 12 years and has been highly successful.

“The first chick hatched in 1988, and we had 90 pairs nesting in the eight-county metro area this spring,” says Voigt Englund, who’s been involved in the reintroduction since the beginning.

Nearly all, if not all of the adults and their chicks in the metro area are descendants of the reintroduced birds. Many use the platforms while a few “freelance,” building large stick nests on the tops of utility poles, freeway light towers, athletic field lights and even wind turbines.

Tree substitutes

Interestingly, these osprey no longer build their nests in trees.

“All of the osprey in the metro area are nesting on manmade structures,” says Mark Martell. He, too, was involved in those early days and now is director of Bird Conservation for Audubon Minnesota. “Osprey need their nests to be higher than everything else, and there just aren’t many appropriate trees near water anymore.”

If osprey took to the reintroduction effort like ducks to water, why didn’t they do it on their own, one wonders. Martell notes that osprey aren’t pioneering birds and don’t move into new areas easily. Once driven out of an area, it takes some effort to bring them back.

For anyone who thrills to the sight of these large, graceful hawks lifting up from a lake or flying overhead — and isn’t that all of us? — those efforts by Voigt Englund, Martell and others are paying off. Osprey once again are a familiar sight as they soar over the metro area.

 

St. Paul resident Val Cunningham, who volunteers with the St. Paul Audubon Society and writes about nature for local, regional and national newspapers and magazines, can be reached at val​writes@comcast.net.

 

  • Osprey notes

    • Osprey almost exclusively eat fish and catch them by plunging feet first into water.

    • While flying, osprey carry fish head first in their talons.

    • They’re big but surprisingly light: Osprey weigh from 3 to 5 pounds.

    • Osprey have built-in nose plugs for water diving.

    • They’re able to hover over water to watch for fish.

    • Osprey nest in Anoka, Carver, Dakota, Hennepin, Ramsey, Scott, Washington and Wright counties.

    • The highest density of metro osprey nests is in Carver Park Reserve in Victoria.

    • Find out more here: www.threeriversparks.org/natural-resources/wildlife-management/osprey-reintroductions.aspx

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