BirdAnalyst
Family · Apodidae · Apodiformes

Swifts Population Trends

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

Swifts 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
Black SwiftAerial insectivores-82%1970
Chimney SwiftAerial insectivores-75%1968
White-throated SwiftAerial insectivores+93%1969
Vaux's SwiftAerial insectivores+203%1970