BirdAnalyst
Family · Alcidae · Charadriiformes

Auks, Murres & Puffins Population Trends

4 species tracked, ordered by long-term trend. Steepest declines first.

Auks, Murres & Puffins species ranked by population trend.
TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →Baseline yearThe first year of the smoothed window the trend is measured from. An earlier baseline means a longer record stands behind the number.Full methodology →History
Common MurreSeabirds-97%1974
Rhinoceros AukletSeabirds-1%1976
Pigeon GuillemotSeabirds+17%1973
Marbled MurreletSeabirds31×1977