How many hours does animals sleep?

Tags

1. #night
2. #giraffes
3. #considerable
4. #sleeping
5. #average
6. #middle
7. #sleep
8. #armadillos
9. #mammalian
10. #somewhere
11. #though
12. #humans
13. #opossums
14. #adult
15. #length
16. #range
17. #horses
18. #hours
19. #requiring