From 20 January to 1 February 1990 we crossed the Sierra de La Laguna, studying the winter birdlife of this isolated mountain range lying between La Paz and Cabo San Lucas, Baja California Sur. From 27 to 30 January we camped at La Laguna (23°30'N, 109°59'W; elevation 1650 m), an open valley surrounded by wooded mountains and a prominent locality in the history of the exploration of Baja California’s biota.