What animal has the smallest balls?

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Tags

1. #reproductive
2. #across
3. #louder
4. #little
5. #surprising
6. #university
7. #testicles
8. #balls
9. #tiger
10. #smaller
11. #organs
12. #researchers
13. #howler
14. #monkey
15. #smallest
16. #found
17. #species
18. #specific
19. #cambridge
20. #trade
21. #monkeys
22. #loudest
23. #weighs