Question

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can be used to differentiate between male northern wheater wheats and male blue - eyed tool wheats

Explanation:

Male northern shoveler and male blue-winged teal have distinct wing color patterns and markings. A key (or bird identification key) is a tool used by biologists and ornithologists to differentiate between similar species or sexes of birds by comparing physical traits like wing features. Alternatively, "field mark" (specifically wing field marks) refers to the unique physical characteristics that distinguish these wings, but a bird identification key is the structured tool for this differentiation. The most precise term for the tool/method here is a bird identification key, often shortened to identification key.

Answer:

identification key (or bird wing field marks)