Known for it's orange lips and orange spines at the tail the orangespine unicornfish is actually hornless. The bluespine unicornfish has the horn (that's why it's called a unicorn fish, duh!) but apparently since this one got all of the color they don't get to have a horn.
The body color on this fish changes the more the fish gets annoyed. When they get aggressive with a predator the body gets a darker blue in color and you can tell by the color of this one he was only slightly annoyed with me.
If you look really closely at the photos you can see the orange spines at the tail actually protrude out in a curved fashion toward the front of the fish. I am told the spines are extremely sharp (and painful should you get too close).
What's that you say? You want to know the Hawaiian name for this fish? Well, if you insist; its the "umauma lei", prounounced "ew-mow-ma lay".
The Master Q was kind enough to work on one of my photos and give me a quick lesson on how to do what he did. Here is his version of the orangespine unicorn fish.