Do hummingbirds sleep at night?

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Tags

1. #state
2. #known
3. #sleep
4. #hummingbirds
5. #hummingbird
6. #actually
7. #hanging
8. #recover
9. #asleep
10. #appear
11. #torpor
12. #upside
13. #their
14. #daily
15. #intake
16. #likely