Blue

Blue Man Group.

After this at Dirty John Bonny, I got me a-thinking: How many blue animals are really blue?

See, the blue in bird feathers and insect wings and in most fish is produced by a kind of selective iridescence, scattering light, like the blue sky does. Link.

That's sometimes called structural color as compared to pigment color.

I think that my featured frog and the nose of a mandrill are examples of blue pigment.

Blue animals in Wikipedia here.

Five part piano version of George Gershwin's Rhapsody in Blue performed by The Five Browns.
About four minutes