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Option 3 : Aves

Ave is the Latin name for the birds - feathered, bipedal, warm - blooded, egg - laying, winged vertebrate animals.

Pneumatic bones are hollow bones which contain air spaces, which help in making the skeleton light in weight. Birds (or Aves) have remarkably specialized bones that are pneumatic, because they are full of air sacs that provide a continuous flow of breath throughout their bodies.

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