Common Poorwill is named after its nocturnal call, but is more notable for its ability to enter a state similar to hibernation during cold snaps, allowing individuals to conserve energy during times when insect prey are scarce.
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Common Poorwill
The Common Poorwill reaches the northern limits of its breeding range in the southern interior of British Columbia and in the Cypress Hills region of Alberta and Saskatchewan, but with records as far east as southwestern Manitoba. The Canadian population is coarsely estimated at around 6,300 individuals, representing 0.4% of the global population and a very low degree of responsibility for Canada. However, the lack of monitoring data precludes estimation of a trend or establishment of a goal for the Canadian population.
There are no reliable sources of information to allow an assessment of population trends for Common Poorwill in Canada. The Breeding Bird Atlas of British Columbia suggests that the species may have experienced a small increase in range in that province, although this may be due to improved search effort and familiarity with the species (Boyd, 2015). Common Poorwill was detected too infrequently on atlas point counts to contribute to knowledge of its abundance. Only a few observations of the species were recorded in the Breeding Birds of Alberta (Semenchuk, 2007). The species is so infrequently recorded on Breeding Bird Survey (BBS) routes that there is no trend available for Canada. BBS results for North America suggest that the continental population has remained relatively stable since 1970. However, the species is poorly sampled throughout its range, and counts are thought to be affected by moonlight and weather, since these affect calling rates (Woods et al., 2005).
No population goal is set for Common Poorwill because there are not enough data to estimate population trends. Improved monitoring is needed to enable development of a population goal for this species.
| Designation | Geographic Area | Status | CITATION |
|---|---|---|---|
| COSEWIC | Canada | Data Deficient | |
| Species At Risk Act | Canada | Data Deficient | |
| IUCN | Global | Least Concern | |
| Wild Species | Canada | Apparently secure |
- Boyd, M. 2015. Common Poorwill. In: Davidson, P.J.A., R.J. Cannings, A.R. Couturier, D. Lepage, and C.M. Di Corrado (eds.). The Atlas of the Breeding Birds of British Columbia, 2008-2012. Bird Studies Canada, Delta, BC. http://www.birdatlas.bc.ca/accounts/speciesaccount.jsp?sp=COPO&lang=en.
- Semenchuk, G.P. 2007. The Atlas of Breeding Birds of Alberta: A Second Look. G.P. Semenchuk, Editor. Federation of Alberta Naturalists. Edmonton, Alberta. 626 pp.
- Woods, C.P., R.D. Csada and R.M. Brigham. 2005. Common Poorwill (Phalaenoptilus nuttallii), The Birds of North America Online (A. Poole, Ed.). Cornell Lab of Ornithology, Ithaca, New York. https://birdsna.org/Species-Account/bna/home.
Common Poorwill is named after its nocturnal call, but is more notable for its ability to enter a state similar to hibernation during cold snaps, allowing individuals to conserve energy during times when insect prey are scarce.
Common Poorwill is primarily reported between April and September in Canada, as it migrates south in the nonbreeding season.