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Maternal investment in northern fur seals ( Callorhinus ursinus): interrelationships among mothers' age, size, parturition date, offspring size and sex ratios

by Boltnev, Alexander I., York, Anne E.
Published in Journal of Zoology (2001)

Northern fur seal young: interrelationships among birth size, growth, and survival

by Boltnev, Alexander I, York, Anne E, Antonelis, George A
Published in Canadian Journal of Zoology (1998)