Once thought to be nearly extinct, trumpeter swans have made an amazing comeback, thanks to efforts by conservationists to restore breeding populations. During the last official count, in 2015, they numbered more than 17,000 in Minnesota alone.

Learn more about these birds when Carrol Henderson, a retired nongame wildlife program supervisor for the Minnesota Department of Natural Resources, presents “The Trumpeter Swan Returns to Minnesota” on Tuesday, Sept. 17 at the Grand Arbor Knute Nelson Community Room in Alexandria. Henderson played a key role in their recovery.

He will speak during the Prairie Lakes Audubon Chapter’s fifth anniversary and silent auction to raise funds for its operating expenses. A nonprofit, the chapter makes its programs and field trips free and open to the public of all ages.

Their program runs from 6-8:30 p.m. and Henderson will speak at 7 p.m. Refreshments will be served from 6-7 p.m.

Henderson also pioneered research projects that documented poisoning of bald eagles from lead ammunition at the Lac qui Parle Wildlife Refuge and assessed the impact of the Deepwater Horizon oil spill on Minnesota loons and white pelicans.

For more information, contact Viola Riggle at 712-449-0216.