Talk:Tank/@comment-1023843-20140519235139/@comment-1276314-20141217211749

Likely a joke.

Seriously though, the difference in a nutshell is tortoises have really short legs and a big heavy shell, although IRL tortoises and the shells are way bigger, but it could be Tank is a baby. http://hypertextbook.com/facts/1999/RachelShweky.shtml says tortoises move at 0.11m/s (likely means an adult), so his real slow speed is well backed by reality; he had barely moved on the goal line.