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

Explanation

### Step-by-Step Solution:

1. **Hollow and Light Bones**: The skeleton of a bird is primarily composed of hollow bones, which makes it lighter. This reduction in weight is crucial for flight, as it allows birds to become airborne more easily.

2. **Modified Forelimbs**: The forelimbs of birds are modified into wings. This adaptation is essential for flying, as wings provide the necessary lift and thrust during flight.

3. **Sturdy Shoulder Bones**: Birds have sturdy shoulder bones that support the flight muscles. These muscles are responsible for the powerful up and down movement of the wings, allowing birds to take off, fly, and maneuver in the air.

...