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Observations are presented on the incidence of mortality between birth and weaning at 30 days of age in the Mongolian gerbil, Meriones unguiculatus. The proportion of young weaned was approximately 80%; it was little affected by litter size or whether or not adjustment had taken place. A slightly higher proportion of males was lost than females. The heaviest mortality occurred within the first 5 days of birth, apparently due largely to neglect. No case of cannibalism was recorded.

Mortality from birth to weaning in the mongolian gerbil, Meriones unguiculatus