Which of the following is not a part of a chicken's skeleton?

The trapezius is not a part of a chicken's skeleton; rather, it is a muscle found in birds, including chickens. Muscles like the trapezius are responsible for movement and support of the wings and body, but they do not form part of the skeletal structure.

In contrast, the ilium, maxilla, and fibula are all bones that can be found in a chicken's anatomy. The ilium is a part of the pelvis, the maxilla forms part of the upper jaw, and the fibula is one of the bones of the leg. Understanding these anatomical components is crucial for recognizing the differences between skeletal and muscular structures in poultry.