Where is the $Kiwi$ bird found?

Which one of the following organisms bears hollow and pneumatic long bones?

Aves are:

Assertion $(X)$: Birds can consume food very quickly.
Reason $(Y)$: They possess a crop.

Students of class $XII$ were given a list of the following characters: clawed toes,curved beak,feathers,pneumatic bones,wings,and fur. In this list,how many are volant adaptations?

Give a scientific reason: Pneumatic bones are present in birds.