Which of the following are NOT a type of wing plumage?

The choice that is not a type of wing plumage is the rectrices. In avian terminology, rectrices specifically refer to the tail feathers of a bird, rather than wing feathers. Understanding this distinction is crucial for identifying different types of feathers and their roles in avian anatomy and aerodynamics.

In contrast, primaries, secondaries, and tertials are all types of wing feathers. Primaries are the main flight feathers located on the outer part of the wing and are essential for lift and thrust during flight. Secondaries are located on the inner part of the wing, providing additional surface area and contributing to lift. Tertials are the feathers that overlap the secondary feathers at the top of the wing, aiding in the aerodynamics of flight and providing insulation. This categorization of feathers is key in the study of bird anatomy and the functional aspects of their flight capabilities.