In ornithology, the lower edge or angle formed where the two halves of a bird's lower jaw come together.
From Greek 'gony' meaning 'angle' or 'knee,' borrowed by ornithologists to describe the angular junction point in bird anatomy.
Bird watchers and ornithologists use this technical term to identify and classify birds because the shape and color of the gonys—that sharp point on the lower bill—is actually different for different species!
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