Abstract
A study of the Rhinoceros Auklet (Cerorhinca monocerata) was conducted on Cleland Island, B.C. (49° 10'N, 126° 10'W). The second author initiated the major part of the project which was to test Lack's (1954) hypothesis that the clutch size of a bird species is determined through evolution by the average number of young the parents are able to fledge. To this end young birds were weighed daily in natural single-chick broods and in artificially doubled broods. Notes were also kept on nesting chronology, feeding behavior, and activity patterns of birds at the colony. This paper discusses the success, chronology, and behavior as observed in 1969, and relates the latter to the outcome of the twinning experiment.
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