Why did Vikings shave their heads?

Related questions

1. Is Ragnar Lothbrok a real person?
2. What is a female Viking called?
3. Did Vikings have horned helmets?
4. What did the Vikings eat?
5. Did Vikings have blue eyes?
6. How did Vikings die out?
7. Do Vikings have tattoos?
8. Why did Vikings not wear horned helmets?
9. Why did Vikings not have horns on their helmets?
10. How does Ivar Lothbrok die?

Tags

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2. #picture
3. #wagner
4. #helmets
5. #opera
6. #drawing
7. #beards
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9. #century
10. #started
11. #popular
12. #wearing
13. #short
14. #vikings
15. #because
16. #fringes
17. #groomed
18. #until
19. #sources
20. #villains