Actually, I had missed that photo when it came out and I thank you for bringing it to my attention. Here's the original photo and an article about it:
http://www.cbc.ca/canada/edmonton/story/2009/08/13/squirrel-banff-photo-brandts-geographic.html
and I was delighted to find that within the article above, there is a site (perhaps one that is different from the one you had difficulties with) which allows people to make up photos featuring the squirrel.
Of course, I HAD to give it a try ;-)
Thanks very much for bringing it to my attention :-)