Isn't this a nice squirrel? This is a Belarus half-ruble note. (Thanks, WikiCommons. If you want to see the rest of the Belarus notes as well as some spiffy Nepalese ones, go here.)
I wish I knew why the US doesn't want to put any beautiful animals on our hard-earned cash. If I do find out I'll be sure to post that. In the meantime, I was all set to bring you more examples of fine financial animal art, but I got totally hijacked by a photoshop contest on FreakingNews.com in which folded banknotes get merged with critters to make . . . hilarity.