Just wanted to pass along an interesting site which tells about the
largest reptile in the world - the leatherback turtle (which has a
shell, so it is "shell related"!) - but not just any individual: one
which lives right here in Eastern Canada. It has been satellite-tagged
and its movements are plotted daily.  Also, there is a gallery of
Sherman (its name), information about its species, etc.

http://www.cwf-fcf.org/pages/sherman.htm

Cheers,
Ross.