Northern Grey Shrike (Lanius borealis) | Text

Northern Grey Shrike Lanius borealis

Current view: Text account

Justification

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). The population trend appears to be stable, 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 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
Rich et al. (2004) estimated the global population to number 1,000,000 individuals. The population in Russia has been estimated at c.100-10,000 breeding pairs and c.50-1,000 individuals on migration (Brazil 2009).

Trend justification
This species has had stable population trends over the last 40 years in North America (data from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007).

Distribution and population

The species breeds in Alaska, northern and central Canada migrating to non-breeding grounds in southern Canada and central USA. Also breeding in central and eastern Russia, northwest Mongolia, central and eastern Siberia and Sakhalin and southern Kuril Islands of Japan, migration takes place to non breeding grounds in northern and eastern China, southern and central Siberia, Mongolia and Hokkaido, Japan.

Acknowledgements

Text account compilers
Derhé, M., Wheatley, H., Westrip, J., Butchart, S., Shutes, S.

Recommended citation
BirdLife International (2024) Species factsheet: Northern Grey Shrike Lanius borealis. Downloaded from https://datazone.birdlife.org/species/factsheet/northern-grey-shrike-lanius-borealis on 22/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 22/12/2024.