Thanks for the replies guys, and thanks for the links motion, I'll def check those out.
Ok, so looks I've been misinformed...hmmm
I was under the impressions a "whale-tail" was more of a rectangular shape.
I found this picture:
EDIT: (guess they don't allow that!
Here is a link, you'll have to copy-paste in a new window)
This looks like some sort of GT2 tail, but obviosuly I'm no expert. =)