LC
Rufous-crowned Sparrow Aimophila ruficeps



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
The global population is inferred to number 1,200,000 mature individuals (Partners in Flight 2019).

Trend justification
The species has been undergoing a moderate decline at an average rate of 0.8% per year between 1970 and 2017 (Partners in Flight 2019). Short-term trends suggest that the population in North America has been stable over the past ten years (Pardieck et al. 2018).

Distribution and population

Aimophila ruficeps occurs in south-western U.S.A. and Mexico (del Hoyo et al. 2011). Subspecies sanctorum on Todos Santos Islands (Mexico) has not been observed on recent visits and is likely to be extinct (Wilbur 1987).

Acknowledgements

Text account compilers
Hermes, C.

Contributors
Butchart, S., Ekstrom, J. & Khwaja, N.


Recommended citation
BirdLife International (2022) Species factsheet: Aimophila ruficeps. Downloaded from http://www.birdlife.org on 27/06/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 27/06/2022.