On 3 July 1979, while conducting a survey of marine bird colonies of coastal Oregon for the U.S. Fish and Wildlife Service, we saw a single Horned Puffin (Fratercula corniculata) roosting on Island Rock, approximately 8 km south of Port Orford, Oregon. The bird (Figure 1) was an adult in summer plumage. It roosted on a rocky outcropping 40 m above the sea surface on the east side of the island, near the south end. During the next 2 hours, while we censused nesting birds on the island from a boat, it disappeared into a crevice for up to 30 minutes at a time. Twice while we watched, it flew from its roost and circled widely around the colony several times before returning to its original site. We climbed up and inspected the crevice but were unable to determine if it was being used for nesting. As Campbell et al. (1979) pointed out, the behaviors we observed are also the activities of scouting pre-breeders and we have not inferred that this was an actual breeding attempt. At the time of our sighting, Island Rock had a population of approximately 350 Tufted Puffins (F. cirrhata).