syringeal

“A short, rounded occipital crest sat at the back of the head; its syringeal bulla was flattened, rather than rounded as in other pochards.”

The Madagascar pochard returns

“Features of its syringeal bulla are unique, it has that rounded, bushy head crest, and various details of the plumage on its flanks, wings and neck are unique.”

The Madagascar pochard returns

“Mimics and others that produce a wide variety of bird song sounds, like the crow, mockingbird, and starling have a greater number of syringeal muscles.”

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“Vincennes, "and something just as creditable to his talent, too -- dissected many birds with special reference to this subject, and gave close attention to birds in the act of singing, both out of doors and in captivity, and I am convinced that he proved the theory of the syringeal origin of bird song to be an erroneous one.”

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