Something squirrelly ... Is it HTML or an image?

I found this on webmonkey -  As they say, Squirrel is a single file that renders as both HTML and a JPEG image. It’s a webpage. It’s an image. It’s Squirrelly. the HTML contains an img element that points to … itself - recursion. Check out the source code of this page to see. Oh and as somebody points out - actually it's a chipmunk.
Click here!