Notes on Reproduction in the Kangaroo Rat, Dipodomys

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Abstract
During a preliminary study of the incompletely understood reproductive anatomy and physiology of the kangaroo rat (Dipodomys), observations were made that do not conform to statements in a recent paper by Fitch (Jour. Mamm., 29: 5–35, 1948). This author states that non-breeding females of D. heermanni have an imperforate and regressed vaginal orifice, while in “apparently” estrous animals the vaginal orifice is open, and its lips are greatly enlarged and thickened. These conclusions resulted from observations of external genitalia only. However, I believe that the situation is more complex than this statement indicates, at least for the species D. ordii.

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