On 18 March 1994, we observed and photographed a single Roseate Spoonbill (Ajaia ajaja) at Estero de Rancho Bueno (29° 19'N, 111° 29'W), Baja California Sur, Mexico. The bird was in breeding plumage and was roosting in the mangroves near the head of the estero. The photograph, on file at the Centro de Investigaciones Biológicas, La Paz, shows the spatulate bill, pale pink body plumage, and contrastingly bright pink shoulders, but the image is too small to be reproduced well for publication. Located at the southern end of the Bahía Magdalena–Bahía Almejas complex on the Pacific coast, the Estero de Rancho Bueno is a coastal lagoon, 11 km long and averaging 300 m wide, fringed by mangroves (Rhizophora mangle, Laguncularia racemosa, and Avicennia germinans).