Try to be like the turtle--at ease in your own shell.----Bill Copeland

     I've always loved the idea of the turtle as totem or spirit animal. 

Symbolic Meaning of the Turtle. When it comes to animal symbolism, turtle is a great example of persistence, determination, endurance and more. By very design, the turtle is a survivor. It has the ability to protect itself against harsh predators.

(Although evil Mitch McTurtle is ruining the goodness of the turtle symbolism for me)