Remarks on the Reproduction, Sex Ratio, and Life Expectancy of the Varying Lemming, <i>Dicrostonyx Groenlandicus</i>, in Nature and Captivity

Résumé

Contains results of a study between Sept. 1949 and Sept. 1953, of a colony started from 16 Greenland varying lemmings and one Mackenzie varying lemming (D.g. kilangmiutak). Records of the colony are compared with field observations and more detailed work done on related genera. Subjects discussed include: age of sexual maturity, litter size, gestation period and litter frequency, sex ratios, care of young, life expectancy and disease.