You are presented with the question "Feathers help what kind of animals fly and provide insulation?" and the following answer choices: 
- preventing heat transfer
 - dragons
 - passenger pigeons
 - butterflies
 - animals in the class Aves
 - airplanes
 - it protects them
 - retaining heat

Now knowing that feathers help birds fly and provide insulation and class Aves is for the birds, literally, choose the best answer.


 

     animals in the class Aves    