Why is a robins egg blue?

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Tags

1. #female
2. #newly
3. #males
4. #pigment
5. #their
6. #eggshell
7. #hatched
8. #enough
9. #contained
10. #colour
11. #brightest
12. #twice
13. #whose
14. #biliverdin
15. #nests
16. #robin
17. #babies
18. #deposited