Many US bird species seen as reaching population ‘tipping point’

By Will Dunham

US bird populations are experiencing alarming declines due to factors such as habitat loss and climate change, according to a new report identifying 112 species that have reached a “tipping point,” including 42 with perilously low numbers and steep downward trends.

Even duck populations, which have been considered a conservation success story, have trended downward in recent years, though they are still higher than 1970 levels, according