...might be because it's been dissected.
That was (since we are "dissecting frogs" already) what one part -- the "obvious" part, I thought; the one that was supposed to be noticed and thus distract the reader from the other, "subtler" one -- of *my* attempt meant: If a frog were three hundred years old, it could hardly be expected to croak any more.
Because...
...it's croaked long ago, as it were.
(I wonder if anyone caught my other, "semi-subtle", references...?)