I read somewhere that it WAS real but they changed it when they found out how to make fake skeletons look real. Or something like that.
See my previous post. ALL the skeletons in the entire ride were real at first. When creating complete fake skeletons became economically feasible, the cadavers were replaced. The only one they left alone was the skull and crossbones (yes, the bones below the skull are also real) over the captain's bed.
Thanks for answering. Now that you mention it I remember reading that all the skulls were real at once, but switched out (I think the reason I read was there were complaints). Anyway, thanks for answering, now I can finally stop wondering when I ride POTC all the time!