Update on the Breeding Distribution of Belding’s Yellowthroat (Geothlypis beldingi)

We update the list of locations occupied by Belding’s Yellowthroat (Geothylpis beldingi), a species endemic to Baja California Sur, on the basis of surveys in June/July 2024, during which we visited most of the oases in the state. A total of 69 sites were surveyed: 25 in the north (San Ignacio to San Javier; G. b. goldmani), 30 in the south (La Paz to Cabo San Lucas; G. b. beldingi), and 14 in the central region. Of these, 13 oases lacked both suitable habitat and yellowthroats, while 14 had suitable habitat but no detection of the species. We documented both habitat and yellowthroats at 42 sites, grouped into 31 distinct locations. Among these, 17 had previous records, six had older records but no recent sightings, and eight had no previous records. Of the previously occupied locations where we found no yellowthroats in 2024, one was in the northern region, two were in the central region (the only central localities reported in the literature), and three were in the southern region. Of the newly identified locations, three were in the north, five were in the south, and none were in the central region. It is possible that other small oases, unmapped and difficult of access, were not included in this study. The lack of records in the central region suggests that the northern (G. b. goldmani) and southern (G. b. beldingi) populations remain isolated or were so in 2024.