do all the mammals have seven neck bones?

Question: do all the mammals have seven neck bones?
- Keywords:
  animal,
  bone,
  mammal
Asked by anon-38113 to Claire, Renata, Suzanne on 27 Jun 2013.
- Suzanne Harvey answered on 27 Jun 2013:
  
  I just had to look this one up, but the answer is great! Apparently most mammals do have seven neck bones, but the two toed sloth has six and the three toed sloth has nine! I had no idea that sloths had exceptional spines, great question 🙂

Question: do all the mammals have seven neck bones?