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
The global population is estimated to number 5 million mature individuals (Partners in Flight 2019).
Trend justification
The species has been increasing at an average rate of 1.1% per year between 1970 and 2017 (Partners in Flight 2019). Short-term trends however suggest that the population has been roughly stable over the past ten years (Pardieck et al. 2018).
Text account compilers
Hermes, C.
Contributors
Butchart, S., Ekstrom, J. & Palmer-Newton, A.
Recommended citation
BirdLife International (2024) Species factsheet: Cassin's Vireo Vireo cassinii. Downloaded from
https://datazone.birdlife.org/species/factsheet/cassins-vireo-vireo-cassinii on 23/12/2024.
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 23/12/2024.