Lower mandible, too. Did the trick.

下颌骨也是 匹配到了他的身份。

The edges of the lower mandible are crossed by numerous fine ridges, which project very little.

下颌骨的边缘被许多细脊交叉， 这些脊非常突出。

The edges of the lower mandible are serrated with teeth much more prominent, coarser and sharper than in the duck.

下颌骨的边缘呈锯齿状， 牙齿比鸭子的牙齿更突出、更粗糙、更锋利。

The lower mandible of the shoveller-duck is furnished with lamellae of equal length with these above, but finer; and in being thus furnished it differs conspicuously from the lower jaw of a whale, which is destitute of baleen.

shoveller-duck 的下颌骨有与上颌骨等长的薄片， 但更细；由于具有这样的构造， 它与鲸鱼的下颚明显不同， 后者没有鲸须。