Search for: [Description = "Survival rate and behavior \(mobility\) of red\-backed voles were investigated from 1978 to 1979 using a one\-hectare out\-door enclosure in a northern forest in Japan. Sex ratio of new\-born young was even, but that in the breeding population deviated toward females. The prevailing female ratio in the breeding population was produced by the two factors\: the females matured earlier than the males, and the survival rate of the females was higher than that of the males during maturation."]

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