Bird populations across the continent have been in decline for years. Numbers have been estimated for years using data from the Breeding Bird Survey, which uses a standard, consistent method across North America. The Breeding Bird Survey puts 70,000 blackpoll warblers in Alberta; Solymos reckons 1.3 million. Both scientists agree the recount changes nothing about the trends in bird populations or the threatened status of some. Wells said other datasets confirm Breeding Bird Survey conclusions about population declines.

Source: CBC News June 21, 2020 16:41 UTC