Abstract
The data herein contained were taken from a litter of five red-backed mice, Clethrionomys gapperi, born in captivity on August 22, 1954, to a female that had been captured on August 17 at Taborton, Rensselaer County, New York. I am indebted to William Kelly of Albany, who caught the mouse and brought her to me. The physical development of young red-backed mice of the species C. rutilus has been discussed in detail by Morrison, Ryser and Strecker (Jour. Mamm., 35: 376–386, 1954). Since the descriptions given there are closely similar to events noted for the young involved in this study, this note deals primarily with the development of various aspects of the behavior pattern, and their time of appearance in young individuals. Within one day after birth the young were capable of vocalization. Shrill and almost inaudible squeaks were heard at this time. The young were hairless and helpless,...
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