Here's another one of the photos that were voted out in the Calendar 2012 poll. I don't quite remember, but from the way she looks this has got to be Mosi at the UK Wolf Conservation Trust (please correct me if I'm mistaken).
UK Wolf Conservation Trust? Cool... da wollte ich auch mal hin. Aber ich dachte, da kann man nur an ganz speziellen Tagen hin oder wenn man eine Patenschaft hat? Oder hab ich das falsch verstanden? Sehr hübsches Foto jedenfalls
Yes, there is a significant difference in behavior too. Generally both morphological and behavioral differences can be seen between Eurasian wolves, North American wolves and Arctic wolves. On the rarer side, there are also Mexican wolves and red wolves (actually considered crosses between coyotes and wolves) which have a quite characteristic habitus.