Well, since it is still too wintery to be blogging about any real live gardening activity, here is another mystery insect I thought I'd post in hopes of identifying since we had such great help last time.
UPDATE: The moth appears to be a male Antheraea polyphemus with common name simply Polyphemus Moth (see discussion and links in comments below). They are relatively common in North America and feed on numerous species of trees and shrubs, not dependent on a single species of plant like the wood wasp we found earlier this winter (see link above). They range from southern Canada to northern Mexico. There is a good possibility there are some in Calgary or perhaps in our own yard. We'll keep an eye out.