So I just learned last week that qiviut (the soft downy fiber from the muskox) doesn't felt!
Maybe you all knew this, but I was so surprised! I've done quite a bit of felting over the years and never knew that. I've felted both yak and American buffalo (both also soft downy undercoats of other, rather beastly animals), so I guess I assumed qiviut would felt as well. Apparently, qiviut doesn't have the scales that other animal fibers have and that's why it doesn't felt.
What's funny is that I learned this curious fact from Lisa Klakulak when she was here teaching some felting workshops. Ironically, she learned this fact from my very own sister several years ago when taking a spinning workshop with Roby! What a small world. But imagine that it took over 2 years and a third person for that info to travel between sisters! I guess that topic never came up in conversation!