How is the skeleton of a bird well-suited for flying?

Following features make the skeleton of a bird well – suited for flying:

• Bones are hollow and

• Shape of the body is streamlined which helps to move easily in
• Bones of hind limbs are specialized for walking, hopping and
• Bones of forelimbs are modified into wings for
• Breastbones hold flight muscles and are used to move the wings up and
• Shoulder bones are