QUOTE(King Leonidas @ Jun 17 2007, 09:15 AM) [snapback]1729154[/snapback]

You can cleary see some kinda "fishtail", so I agree that it's a CGI based on a killer whale jumping outta the water

Although it is clearly a fake, or it would be front page news, there is no reason why a plesiosaur could not have a fluke like tail. Other marine reptiles like the ichthosaurs do. Plesiosaurs easily could have, but when there are only bones, it is hard to say. If there were no whales today, and we only had their skeletons to go by, we wouldn't know what the tails actually looked like.
And if Nessie turns out t be real, I doubt she will have any connection to a Plesiosaur though this is a sudccesful design for a marine animal and other creatures could have evolved into something similar.