Finnish populations of the pochard have fallen a staggering 80% in the past 20 years

Nature preservation group BirdLife Finland reports that domestic populations of the endangered common pochard have decreased massively in the past two decades. BirdLife's calculations show that Finnish populations of the common pochard (Aythya ferina) have fallen a staggering 80 percent in the past 20 years. The organisation hopes to help revive the species by naming it the year's top bird.In the early 1970s the Kokemäki river delta in Satakunta was bustling with some 250 pairs of pochards. Local calculations from a few years ago put the figure at just 30. These birds feed mainly by diving or dabbling. They eat aquatic plants with some molluscs, aquatic insects and small fish. They often feed at night, and will up-end for food as well as the more characteristic diving.

Sources:

YLE News, 24 Jan 2018
https://yle.fi/uutiset/osasto/news/bird_of_the_year_endangered_pochard_…
Wikipedia
https://en.wikipedia.org/wiki/Common_pochard