http://wondermark.com/zoo-table/

If you haven't looked at this link, do it now.
I'm serious, it will make your day. Even for a few moments, look at this link. It's work-safe, I promise, though your peals of laughter at the squeagle and Real Unicorn may draw some odd looks from your coworkers.

On a related note, I think I need to draw some of these. Any suggestions?