Here's an amazing video of a man who has trained a turtle to obey his commands. The tricks would not be amazing if we were dealing with a dog, but they are rather impressive for a turtle.
I'm not sure that too many of my readers have ever tried obtaining turtilian(FN1) compliance with commands, but it is not easy. Turtles are not super-compliant animals.
But I think it is fair to point out that the result shown is not simply "turtle instinct," but instead is the result of man directing the exercise of a lower creature's will.
Footnote 1: Do not confuse with Tertullian.