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Re: Sauropod Tails (The End...and a bit more)

>        The are also many species of knob-tailed geckos. The last I
>heard there was no clear function for these knobs, so there is always
>the possibility that there are things going on in nature that we are
>yet to understand. On second thought, make that a certainty.
>        Dann Pigdon

What is the anatomical make up of the knob, is it a fleshy protuberance or
has it got an expanded bone core?