I went to Pennsylvania in February and shot some wolves. It became obvious that you do not approach a wolf when they have food, are eating food or are chasing food. Here is a shot of a wolf indicating to others to stay away from his food:
Timber Wolves have patterns that many people can easily associate with a wolf. Again these are big animals that you want to keep at a good distance or atleast when they are well feed and not really interested in you.
Black wolves seem to be a mysterious kind of animal - the whole black color seems to change their personality or atleast the way you look at them.
More photos can be viewed at my site: http://www.imagesofwildlife.com/