Guerrero Negro in Baja California Sur is known for its marine lagoons that are the foremost calving site of the grey whale. Yet an impressive array of more than 200 bird species inhabits the area which is the most important wintering site for migrants like the red knot, marbled godwit, short-billed dowitcher, brant goose as well as many others and one of the most important breeding sites for the osprey. This quick guide presents illustrations of more than 100 species of birds found commonly around Guerrero Negro.