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Bibliography stressing recent literature dealing with biology of the sea otter (Enhydra lutris).
"The purpose of this circular is to present brief descriptions, drawings, and photographs to assist in identifying the seals, sea-lions, walrus and sea otter of the Pacific to Point Barrow and the Hawaiian Islands. For each of the twelve species, the physical characteristics, range, and habits are summarized to provide a convenient source of life-history information."-- page 1.
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Introduction. Sources and methods ; Counts and measurements of seals ; Age determination -- Components of the herd. Bulls ; Bachelors ; Pups ; Cows ; Yearlings -- Present size of the herd. Life habits ; Estimate of the size of the herd from the trend of the commercial harvest ; Estimate of the size of the herd from the trend of the harem bull count -- Appendix A. Effect of sealing on fluctuations in herd size 1786-1951 -- Appendix B. Fecundity of males -- Appendix C. Size of the average harem -- Appendix D. Age criteria for bachelor fur seals -- Appendix E. Escapement of bachelors from the commercial kill -- Appendix F. Calculations for the size of the pup class in 1947 from tag recoveries -- Appendix G. Serial photography on the Pribilofs.
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