California’s combined state files contain 233 Peromyscus fraterculus records: 49 from iNaturalist and 184 from GBIF. It ranks 151th among 241 mammals in this California record comparison, placing it in the middle third. That’s a ranking of submitted records, not a head count of animals.
The monthly series reaches its high point in May, with 44 records in the busiest month. Records appear in 10 of 12 months, so the pattern shows when sightings were documented, not when the species must be present or absent.
California accounts for about 93% of the mapped GBIF records summarized on the national Peromyscus fraterculus page. That’s a large share of the known record footprint, though differences in survey effort can strongly shape the percentage.
Full species profile
