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*** Inguinal canal remains open.
 
*** Inguinal canal remains open.
 
** In the adult male they lie in two almost hairless scrotal sacs.
 
** In the adult male they lie in two almost hairless scrotal sacs.
* Scrotal sacs are cranial to the penis.
+
* Scrotal sacs are cranial to the penis (In the majority of placental mammals they lie caudal to the penis).
 
* No nipples
 
* No nipples
 
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