how do bats bend their wings but birds can not

Question: how do bats bend their wings but birds can not
- Keywords:
  bat,
  bird,
  wing
Asked by 385radh39 to Alex, Amanda, Marco, Olivia, Sha on 13 Mar 2017.
- Alex Evans answered on 13 Mar 2017:
  
  Good question!
  
  Birds can in fact bend their wings! They can fold them away when they’re not flying and can bend them in plenty of ways during flight!
  
  Bats and birds aren’t actually all that different. They both have the most of same bones and muscles in their “arms” just like us, but instead of feathers, bats have skin between their long finger bones!

Question: how do bats bend their wings but birds can not