Tortoise != turtle. The latter are those things that can swim really well. The former, sometimes not. I'm sure they were all too busy listening to Phish to go to biology class or even a zoo.
Edited By Malcolm on 1428174598
Diogenes of Sinope: "It is not that I am mad, it is only that my head is different from yours."
Arnold Judas Rimmer, BSC, SSC: "Better dead than smeg."