Trend results for Chimney Swift

A comprehensive assessment of this species' status is available, on the Status of Birds in Canada web site, or for waterfowl, in the most recent report on the Migratory game bird hunting.

Trend results can be filtered by selecting a new time period.


View definitions of the trend results table columns.

Select a geographic area name in the first column to view graphs of annual indices and maps of the regions included in the analysis. Use the scroll bar to view additional columns.

Long-term trend estimates for Chimney Swift in all regions of Canada
Geographic area Time period Annual trend Limits Overall reliability N routes Reliability details Probability of decrease Probability of increase Population change Population change - lower limit Population change - upper limit Probability of population change during time period
Lower Upper Geographic coverage Local data weight Precision >50% decrease 25%-50% decrease 0%-25% decrease 0%-33% increase 33%-100% increase >100% increase
Canada; Long-term 1970-2021 -4.06 -4.6 -3.57 High 240 0.73 0.993 1.03 1 0 -87.9 -91.2 -84.7 1 0 0 0 0 0
Manitoba; Long-term 1970-2021 2.75 -1.08 7.21 Low 5 0.399 0.712 8.29 0.0733 0.927 299 -77.9 2440 0.013 0.0257 0.0346 0.045 0.105 0.777
New Brunswick; Long-term 1970-2021 -2.99 -3.89 -2 High 36 0.981 1 1.88 1 0 -78.7 -88 -66.4 0.999 0.001 0 0 0 0
Nova Scotia and Prince Edward Island; Long-term 1970-2021 -4.91 -6.03 -3.87 High 31 0.912 1 2.16 1 0 -92.3 -96.1 -87.1 1 0 0 0 0 0
Ontario; Long-term 1970-2021 -5.69 -6.54 -4.84 High 92 0.673 1 1.71 1 0 -94.9 -96.9 -92.2 1 0 0 0 0 0
Québec; Long-term 1970-2021 -3.31 -4.29 -2.47 High 76 0.655 1 1.82 1 0 -82.1 -89.9 -72.8 1 0 0 0 0 0
Boreal Softwood Shield (BCR 8); Long-term 1970-2021 -3.38 -8.91 -0.193 Low 3 0.541 1 8.72 0.989 0.0107 -82.7 -100 -48.7 0.947 0.032 0.01 0.00537 0.00333 0.002
Prairie Potholes (BCR 11); Long-term 1970-2021 2.75 -1.08 7.21 Low 5 0.399 0.712 8.29 0.0733 0.927 299 -77.9 2440 0.013 0.0257 0.0346 0.045 0.105 0.777
Boreal Hardwood Transition (BCR 12); Long-term 1970-2021 -4.96 -6.16 -3.89 Medium 68 0.471 1 2.27 1 0 -92.5 -96.3 -87.3 1 0 0 0 0 0
Lower Great Lakes / St. Lawrence Plain (BCR 13); Long-term 1970-2021 -3.9 -4.66 -3.11 High 74 0.973 1 1.55 1 0 -86.9 -91.9 -81 1 0 0 0 0 0
Atlantic Northern Forest (BCR 14); Long-term 1970-2021 -3.66 -4.4 -3.04 High 90 0.875 1 1.36 1 0 -85.1 -90.1 -79.5 1 0 0 0 0 0
Manitoba (Prairie Potholes (BCR 11)); Long-term 1970-2021 2.75 -1.08 7.21 Low 5 0.399 0.712 8.29 0.0733 0.927 299 -77.9 2440 0.013 0.0257 0.0346 0.045 0.105 0.777
New Brunswick (Atlantic Northern Forest (BCR 14)); Long-term 1970-2021 -2.99 -3.89 -2 High 36 0.981 1 1.88 1 0 -78.7 -88 -66.4 0.999 0.001 0 0 0 0
Ontario (Boreal Hardwood Transition (BCR 12)); Long-term 1970-2021 -7.87 -9.47 -6.26 Medium 36 0.447 1 3.21 1 0 -98.5 -99.5 -96.7 1 0 0 0 0 0
Ontario (Lower Great Lakes / St. Lawrence Plain (BCR 13)); Long-term 1970-2021 -4.55 -5.52 -3.63 High 56 0.988 1 1.89 1 0 -90.7 -94.5 -85 1 0 0 0 0 0
Québec (Boreal Softwood Shield (BCR 8)); Long-term 1970-2021 -3.38 -8.91 -0.193 Low 3 0.541 1 8.72 0.989 0.0107 -82.7 -100 -48.7 0.947 0.032 0.01 0.00537 0.00333 0.002
Québec (Boreal Hardwood Transition (BCR 12)); Long-term 1970-2021 -3.59 -5.27 -2.13 Medium 32 0.495 1 3.13 1 0 -84.5 -95.4 -69.3 1 0 0 0 0 0
Québec (Lower Great Lakes / St. Lawrence Plain (BCR 13)); Long-term 1970-2021 -3.02 -4.32 -1.78 High 18 0.943 1 2.54 1 0 -79 -91.4 -64.2 0.998 0.002 0 0 0 0
Québec (Atlantic Northern Forest (BCR 14)); Long-term 1970-2021 -3.09 -4.51 -1.77 High 23 0.715 1 2.75 1 0.000333 -79.9 -92.3 -62.2 0.992 0.00800000000000001 0 0.000333 0 0
Nova Scotia and Prince Edward Island (Atlantic Northern Forest (BCR 14)); Long-term 1970-2021 -4.91 -6.03 -3.87 High 31 0.912 1 2.16 1 0 -92.3 -96.1 -87.1 1 0 0 0 0 0

This web site may be cited as: Smith, A.C., Hudson, M-A.R. Aponte, V.I., English, W.B., and Francis, C.M. 2023. North American Breeding Bird Survey - Canadian Trends Website, Data-version 2021. Environment and Climate Change Canada, Gatineau, Quebec, K1A 0H3

Any use of these BBS results for Canada should acknowledge the hundreds of skilled volunteers in Canada who have participated in the BBS over the years and those who have served as provincial or territorial coordinators for the BBS.

  1. Smith, A. C., & Edwards, B. P. M. (2020). North American Breeding Bird Survey status and trend estimates to inform a wide range of conservation needs, using a flexible Bayesian hierarchical generalized additive model. The Condor, duaa065. https://doi.org/10.1093/ornithapp/duaa065
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