Mt. Crested Butte, all above 9,000 ft (2,700 m) elevation. He was often the oldest runner and his energy was legend-he could out-walk or out-run almost everyone. The no-talent show at RMBL was an annual event in which Bill made fun of himself and others. Music was a major part of his life; he made a backpacking mandolin for hiking and saved his better instrument for concerts with the Gothic Chamber Music Ensemble, which he had organized. Bill wrote the species accounts in The Birds of North America for Broad-tailed, Calliope, and Rufous hummingbirds, with Lorene collaborating on two of them. He believed that researchers should write for the public and published articles in Scientific American, Natural History, Wild Bird, and other popular magazines. Often he was a consultant for major television productions on birds, particularly hummingbirds. At RMBL, he established a scholarship for journalism students who were interested in science. He was recruited by Gary Nabhan for the Forgotten Pollinators program at the Arizona-Sonora Desert Museum in Tucson. That involved considerable field study in Mexico on Rufous Hummingbirds, meshing well with his long-term efforts to track the species to and from its wintering grounds. During the course of many trips to Mexico, Calder introduced students there to the banding and study of hummingbirds. His banding included Neotropical migrants and he is said to have lost many bands in Mexico, reputedly placed on nonmigratory species, contrary to banding regulations. Some of his Mexican students studied at the University of Arizona or RMBL, sometimes partially supported by funding set up by the Calders. On one trip to Mexico, he asked a participant Have you ever looked at the eye of a hummingbird with a hand lens? You can see the universe there. To describe Bill Calder as an environmentalist would be an understatement. He initiated and taught several conservation biology courses at different levels and was always prepared with quantitative data to support his points. Students in those classes were taken on many field trips; even if a student retained few facts, the outdoor experience would be of lasting value and ultimately benefit the environment. He lived what he preached (he regularly biked several miles to campus), did not throw things away, and built many things from scrap and spare parts. His resources have helped RMBL protect lands surrounding it. Unrestrained enthusiasm and spontaneity aptly describe Bill's approach to life, science, family, environment, and teaching. He and his beloved and devoted Lorene were together for 47 years; their daughter Susan (who once bicycled from Tucson to Gothic with her father) and son Bill both share their parents' environmental concerns. Innumerable friends, students, and colleagues miss him and his inspiration.