One of the defense mechanism's of the turtle is the ability to hide in it's shell.
Hide in There Shells
The shell
There is no "one" specific animal that is safest since each animal is adapted to a different ecosystem. But the likely answer would be the alligator snapping turtle with its extremely hard shell as defense and powerful bite as extra defense.
The turtle doesn't need anything to protect itself it just has its own shell to protect itself. The turtle gets in its shell and stay there until the enemy is out looking for new preys
The Common Musk Turtle, Sternotherus odoratus, is known as the stinkpot because of the bad smelling musk glands it uses for defense.
its shell
They bite. They also have a protective shell that they can draw back into.
The moris turtle
the turtle eat some small fish and shrimp as main feed.
Well the shell is very helpful when it comes to defense for a predator, it is the turtles home and the turtle is connected to the shell, so the shell grows with the turtle
the shell of a turtle. the smell of a skunk. the camouflage of a chameleon.