We also visited the National Museum of the American Indian, a relatively new Smithsonian museum that I had visited after it first opened. I remember not liking it much then, and still am not enamored with it, although some of the displays are interesting.
Thanks to David (globalgadabout) for identifying the kind of bird this is.
This loon mask, part of the "Window on Collections" display, was designed by Edward Kiokun (1903-1998), Cup'ik [Mekoryuk, Nunivak Island, Alaska] and made from driftwood and bird quills.
Göreme, Cappadocia, posted earlier: