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The crested duck (as in this picture) looks this way due to a genetic mutation that causes a skull deformity, which allows fatty tissue to come out of a gap in their cranium. Then feathers grow on top of the tissue, creating the dignified look of a waddling English barrister. It's essentially a tumor hairpiece.

"What's the ruling sir?!?!" "Quack" "Oh My God! NOOOOO!!!"