What muscle moves the scapula and allows the head to turn left or right in chickens and turkeys?

The trapezius muscle plays a crucial role in both the movement of the scapula and the rotation of the head in chickens and turkeys. This muscle is responsible for stabilizing and moving the scapula, allowing for actions such as raising the wings and adjusting body posture. In terms of head movement, the trapezius assists in turning the head from side to side, enabling these birds to have a wide range of vision and awareness of their surroundings. The functionality of the trapezius is particularly important in poultry, as it aids in their ability to navigate their environment effectively. Other muscles listed may have their specific roles, but they do not provide the same combination of scapular movement and head rotation as the trapezius does.