Why do turtles need to swallow underwater?

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Tags

1. #evolved
2. #inside
3. #expel
4. #swallow
5. #water
6. #stomach
7. #actually
8. #keeping
9. #esophagus
10. #without
11. #while
12. #turtles
13. #aquatic
14. #specially
15. #saliva
16. #produce
17. #constrict