River otters need year-round open water, which limits them to a small slice of New Mexico: the upper Rio Grande around Rio Grande del Norte National Monument, Carson National Forest, and the Sangre de Cristo Mountains. State wildlife managers reintroduced otters to this stretch of river after the species had largely disappeared from New Mexico, and NatureServe’s SH, Possibly Extirpated, rank still reflects that history even as sightings continue.
Unlike most species in this survey, most of New Mexico’s 69 records come from iNaturalist rather than museum data, meaning recent photographed sightings outnumber older specimen records, a sign the reintroduced population is actively being seen. Records spread fairly evenly across the year rather than clustering in one season, with modest upticks in February, October, and December.
