Why do houseflies rub their front legs together?

Question: Why do houseflies rub their front legs together?
- Keywords:
  housefly,
  leg,
  rub
Asked by ladysovereignezza to David, Luna, Mark, Melanie, Probash on 23 Mar 2011 in Categories: General.
- David Pyle answered on 23 Mar 2011:
  
  Good question, but I’m afraid I have no idea!
- Luna Munoz answered on 23 Mar 2011:
  
  I don’t know why. Are they hatching some evil scheme? 🙂

Question: Why do houseflies rub their front legs together?