Great Basin Naturalist


Observational data from spring and fall 1996 and spring 1997 for the region near Mulegé, Baja California Sur, Mexico, are summarized in tabular form. In addition, new or noteworthy data for 17 species are annotated to provide clarification of previously published records. A uniquely plumaged bird, too far south for a female American Robin (Turdus migratorius) in basic plumage and too far north for the endemic "San Lucas" Robin (Turdus migratorius confinis) and intermediate in coloration between the two, was recorded. Range expansions are documented for several species including the European Starling (Sturnus vulgaris), Anna's Hummingbird (Calypte anna), Western Meadowlark (Sturnella neglecta), White-faced Ibis (Plegadis chichi), and White-fronted Goose (Anser albifrons). Least Grebes (Tachybaptus dominicus), a species of concern which is apparently declining in numbers, and Belding's Yellowthroat (Geothlypis beldingi) a species endemic to Baja California Sur, were observed in the freshwater marsh during all 3 study periods.