Thirty-five years of coaxing the return of trumpeter swans to Minnesota -- starting with 40 birds and 50 eggs -- have paid off. Just cup your ear and listen.
Thousands of the birds send up their clamorous, horn-like honks every morning from the Mississippi River at Monticello, where they congregate for winter corn feeds.
A U.S. Fish and Wildlife survey taken Jan. 5 to 8 at 20 locations in 14 counties found more than 5,500 swans, confirming that "the population of trumpeter swans in Minnesota has more than doubled in the last five years."
"The results are higher than anyone expected," said Larry Gillette, wildlife manager for Three Rivers Park District.
The big, white swans with the regal carriage and long, gracefully curved necks -- among the largest birds in North America -- were hunted to extinction in Minnesota in the 1800s.
In the 1960s, Three Rivers, then known as Hennepin Parks, started to restore the state's trumpeter swan population with 40 birds brought from a national wildlife refuge in Montana.
The state's Department of Natural Resources joined the effort in the late 1980s, with 50 trumpeter eggs it ferried here from Alaska.
Now the swans are thriving "beyond our wildest expectations," said DNR regional wildlife specialist Katie Haws, who remembers the 1987 release in northwest Minnesota of 21 birds raised from the Alaska eggs.