Isn’t he gorgeous? He’s an Australian peacock spider (Maratus volans) and the photo is by Jürgen Otto. He has a whole gallery of even better photos of this spectacular little arachnid that you’ll want to check out. However what you really have to see is his video of the dance the males perform to attract the females (you might want to watch it on YouTube for the slightly larger format):
Absolutely wonderful images that demonstrate how apt the common name for these little spiders is. Thank you Jürgen for sharing them.
[Hat tip to Jerry Coyne.]