• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

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 has not been quantified, but it is not believed to 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 size is unknown given recent taxonomic splits, but it is assumed to be very large (see Partners in Flight 2019).

Trend justification
The population trend is difficult to determine because of uncertainty over the impacts of habitat modification on population sizes. It is here precautionarily suspected that the species is declining slowly (see Meehan et al. 2018; Pardieck et al. 2018; Partners in Flight 2019).

Passerella iliaca breeds from Alaska through central Canada to the north-eastern U.S.A.. It migrates to non-breeding grounds in the south-eastern U.S.A..

Text account compilers
Hermes, C.

Contributors
Butchart, S., Derhé, M. & Ekstrom, J.

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Recommended citation
BirdLife International (2024) Species factsheet: Red Fox-sparrow Passerella iliaca. Downloaded from https://datazone.birdlife.org/species/factsheet/red-fox-sparrow-passerella-iliaca 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.