Which of the following does not describe a portion of a raptor's wing?

The cere is not a part of a raptor's wing; rather, it is a fleshy structure located at the base of the beak. It serves various functions, such as housing sensory organs and facilitating breathing while the bird eats. The cere can vary in color and prominence among different species of raptors, but it is distinctly separate from the wing anatomy.

On the other hand, coverts are small feathers that overlap and provide contour and insulation to the wing. The alula is a small flap of feathers on the leading edge of a raptor's wing, crucial for managing airflow and maneuverability during flight. Secondaries are the longer flight feathers located further down the wing, which play a vital role in providing lift and aiding in gliding. Understanding these specific parts of a raptor's wing helps in recognizing their function during flight as well as their overall anatomy.