Pearl
The pearl mutation, which is sex-linked, removes the melanin
from the centers of all grey feathers, giving the affected
plumage a "scalloped" appearance. While females retain this
coloration throughout their lives, most males lose the pearl
markings after their first molt, after which they look like
dark normal grey birds.
This mutation can be combined with others to change the
appearance of the pearl markings; a cinnamon pearl, for example,
will have brown edgings on the scalloped feathers, and a
whiteface pearl's feathers will have white centers rather than
yellow ones.
