The Snowy Owl will be going into hibernation soon; March 19 soon. Be sure to capture one now before it's too late. You'll have to wait until December 21, 2014 for your next chance.
If you can't seem to find a rare quality one in the wild, remember that you can always capture one of any quality (but make sure it's the breed you want), and then upgrade it later using a battlestone. For collectors, it's better than nothing!
Personally, the Snowy Owl is my favorite out of all the pets that share the same model. The colors are subtle and graceful, very pretty. :)