Three swans swimming together are depicted on this color postcard. The inscription identifies them as "White and Whistling Swans, Zoological Garden, San Diego, Calif." The two swans on the right are colored as white swans, while the one on the left might be a whistling swan, which has only white plumage with black eyes and beak, but sometimes with a rusty color on the head or neck. The San Diego Zoo is in Balboa Park, San Diego, California. The publisher operated from 1914-1934.
