Comparison between male rat and female rat

Male rat
Female rat
1.        Larger in size
Smaller in size
2.        Nipples are degenerate
6 pairs, fully functional, 3 pairs in thorax and 3 pairs in abdomen
3.        Scrotal sacs present
4.        Penis present
5.        Vulva absent
6.        Urethral opening at the tip of the penis is common opening for the passage of the sperms and urine
Separate opening in front of vulva

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