I do not know where it has come from but reverse image search can give you an idea of where it shows up!
http://www.tineye.com/search/f32bf3095fd795679f2bc992f257fe7371f3b6cc/On 6 Feb 2012, at 14:42, Black Flakk wrote:
> Can anyone tell the origin of this photo?
>
>
http://rsb.info.nih.gov/ij/images/cat.jpg>
> He's very famous in the internet.