Why do frogs scream?

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Tags

1. #attacks
2. #reasons
3. #serve
4. #could
5. #probably
6. #scientists
7. #startle
8. #secondary
9. #instance
10. #predators
11. #scream
12. #evolved
13. #attract
14. #agree
15. #attackers
16. #evolutionary
17. #mechanism
18. #currently