In North America, the northern pintail Anas acuta breeds from the prairie pothole region of the Upper Midwest across Canada and Alaska. The northern pintail’s North American population has been in a tailspin since the late 1950s. Numbers have dropped from an estimated 10 million in 1957 to around 3 million today. Loss of habitat and changes in agriculture appear to be the most serious threats to North American pintails.
Source: Smoky Mountain News, 18 January 2012