External Anatomy, Reproduction, Distribution 
Figure 1-10: Drawing of ventral view of two litter mates, 14 days old, demonstrat- 
ing sex differences. Note larger urogenital orifice of male and smaller one of female. 
Preputial opening of male is circular or slightly oval; it has pointed form in female. 
Note longer space between urogenital openingand anus in male, and teats in female. 
Figure 1-11: Ventral view of adult female during lactation, which causes teats to 
become prominent. 
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