Which Feature Does Not Characterize the Nasal Salt Glands of Birds

Which feature does not characterize the nasal salt glands of birds?

A) The glands are in depressions in the skull, just above the eyes.
B) The glands concentrate salt so extracellular fluid matches that of food consumed.
C) The glands are found in species that feed on marine animals.
D) Cells lining the tubules of the glands actively transport Cl^- into the tubules, and Na⁺ follows.
E) In the glands, bundles of tubules drain into central canals, which drain into the nasal cavity.