Wings, hollow bones, and feathers.
its just how the bird is and some of its characteristics but this question was very poorly worded
Feathers are a structure that are common to all species of bird. Most feathers are very similar in structure, although they vary depending on how and where the bird lives.
They all have 'a' for an article. ;D
They all have eyes.
Living things share all of the following characteristics except _____.
While not all birds can fly, there are other things that they do have in common. All birds have feathers, lightweight skeletons, beaks, and all lay eggs.Wings
Genitals
production of light
They contain cytoplasm.
its a bird
A kiwi is not like a mammal. It has all the characteristics necessary to classify it as a bird alone.
is it bird fether