On 22 January 1973 my family and I were on the Carrizo Plain at Soda Lake in San Luis Obispo County. At Ramer Lake, a small pond approximately 0.2 mile south of the town of California Valley, I saw two white birds on the opposite shore, little more than 100 yards distant. Training a 20x telescope on the birds, I saw them to be swans, both apparently mature in plumage. As the swans swam about I could see that one was significantly larger than the other. The larger swan had a head much the shape of a Canvasback’s (Aythya valisineria). It became obvious the smaller bird was the expected Whistling Swan (Olor columbianus), and the larger a Trumpeter Swan (Olor buccinator). Desiring to get a photographic record, I returned to the car and put a 640mm lens on my camera, and getting as close as I dare to the birds, took a half dozen pictures. The pictures clearly show a Whistling Swan with a Trumpeter Swan (Figure 1).