It looks like there is a variety of creatures represented with the masks displayed in this cabinet at the Museum of Anthropology on the campus of the University of British Columbia. All I know is that it is a crazy extensive collection. For every one or two pieces you can see down here in Seattle, there are 6 -10 -who know 20 more displayed here. Certainly worth a visit anytime you're in Vancouver. I could spend days there.
Click on the phot to go to the museum's main page.