I would not jump to conclusions so fast. Turtles have a mighty appetite for the flesh and tight grip that never loosens unless they want it to. And they never want it to. Their claws are sharp as razors. Laceration is a risk in handling them.
Moreover, unlike the slow and bumbling zombie, they are deceptively fast on their flippers, even on land, and will reach your big toe to feast upon it whilst you waste time gaping in amazement at their speed. Lastly, whilst zombies are rather helpless in water, turtles are anything but. They will swim towards your presumed safe haven amidst the azure depths, enter and strike, and you will never know what hit you.
In short, the turtle is a formidable foe. I would not like to face it.
Yet I do not fear it. For that, they are much too cute.