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2019-04-09. The Comeback of Trumpeter Swans.

posted Apr 10, 2019, 8:46 AM by Alan Gould
By Karen Weintraub, The New York Times. [https://www.nytimes.com/2019/04/09/science/trumpeter-swans-ontario-canada.html] For GSS Losing Biodiversity chapter 6. Excerpt: Bev Kingdon...has been part of a small coterie of volunteers who have helped restore trumpeter swans to Ontario, Canada. North America’s largest waterfowl, the trumpeter was nearly extinct in Canada and the lower 48 states for the better part of a century — brought down by the shotguns of Europeans. Now, these majestic birds are a success story. There are more than 1,000 trumpeters in Ontario that headed north last month, many to raise their next brood. Restoration projects have also been successful in the United States, in the upper Midwest states of Minnesota, Wisconsin, Iowa, Ohio and Michigan, returning swans to at least some of the areas they inhabited before Europeans arrived in North America. The natural population in Alaska, which became a key source for the restoration efforts, also remains strong, with more than 22,000 adults counted in the last aerial survey conducted in 2015. ...By 2002, Ontario’s population was self-sustaining and it has grown every year since. ...Trumpeter swans are protected under the Migratory Bird Treaty Act, but birds are still occasionally killed by accident or on purpose. Power line strikes and illegal shootings commonly cause premature death....  
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