Moonlarks, or suldreen, when called by their proper name, are rare birds. Moonlarks lay their eggs in water (more specifically oceans) and allow for the tide to carry the eggs away. Baby moonlarks must make their own way in the world without a family. Because of this nesting habit the Black Swan named Sophie project moonlark; tossed out into the world without other elves. Alden borrowed two moonlarks from the sanctuary to study their habits in book 1.
Moonlarks have silver feathers, long legs like a crane, a neck like a swan, and a long tail like peacocks.