https://catalogue-scientifique.canada.ca/record=3870752~S6*frc
Department of Fisheries and Oceans, Scientific Information and Publications Branch, 1983
About 25% of Caspian seal (Pusa caspica) pups die in the first year of life. The mortality rate of adult seals ranges from 0.6 to 1.7%, because of biotic and...
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