LC
Grey Vireo Vireo vicinior



Justification

Justification of Red List Category
This species has a very 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). The population trend appears to be increasing, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is very 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
Partners in Flight estimate the global population to number 460,000 mature individuals (A. Panjabi in litt. 2017).

Trend justification

This species has undergone a non-significant increase over the last 50 years in North America (177% increase between 1966 and 2015 based on the North American Breeding Bird Survey [Sauer et al. 2017], or 75% increase between 1970 and 2014 based on Partners in Flight [A. Panjabi in litt. 2017]). Recent trends, however, suggest a very large, significant increase of 90.2% over the last three generations (Sauer et al. 2017).

Distribution and population

Grey Vireo occurs in the southwestern USA and northwestern Mexico.

Acknowledgements

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

Contributors
Panjabi, A.


Recommended citation
BirdLife International (2020) Species factsheet: Vireo vicinior. Downloaded from http://www.birdlife.org on 06/08/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 06/08/2020.