Canada Warbler Cardellina canadensis


Justification of Red List Category
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is extremely large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Population justification
The global population has been estimated at 1,400,000 individuals.

Trend justification
Although data indicates a rapid annual decline of 3.8% between 1980 and 2007 (Sauer et al. 2008), the most recent data from the Breeding Birds Survey suggests a more moderate decline of 0.63% per annum between 1998 and 2009 (Sauer in litt. 2010). This equates to a decline of 6.3% over this period, hence a decline of 1-9% over the past 11 years (three generations) is estimated.


Text account compilers
Ekstrom, J., Butchart, S.

Recommended citation
BirdLife International (2019) Species factsheet: Cardellina canadensis. Downloaded from on 16/06/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from on 16/06/2019.