Complex sentence: Often included with "J. h. caniceps" as' gray-headed juncos, it differs from the gray-headed junco proper in having a more silvery bill with a dark upper mandible, a variable amount of rust on the wings, and pale underparts.
Split into simpler sentences: Often included with "J. h. caniceps" as gray-headed juncos. It differs from the gray-headed junco proper in having a more silvery bill with a dark upper mandible, a variable amount of rust on the wings, and pale underparts.