Most cats (except some House Cats) know full well that they cannot get away with eating Wiggys because of RoboSquirrel.
RoboSquirrel is a really big, strong, fast and clever Wiggy, and his main job is to get cats (and other animals) that even think about eating wiggys. He appears, beats up the sinning animal, pulling its tail and nibbling its ears. Then leaves again. Very few cats have actually seen RoboSquirrel because most cats do not dare eat wiggys.
Also, most squirrels have never seen him, because there is no need for Robosquirrel to appear in front of squirrels. But RoboSquirrel does exist, because if he didn't squirrels would be more scared of cats than they are.
Baby RoboSquirrels
Because RoboSquirrel is really good, it was decided by the Great Wiggy that RoboSquirrel was going to have children.
As Robosquirrel is primarily robotical (with a fluffy brain), normal sex would not work. A host of nanobots was created to build nine new RoboSquirrels.
The nanobots worked in pairs, on an adaption of the green goo/blue goo principal, where if you removed one type of nanobot both types would be useless and cease to duplicate.
When the baby Robosquirrels were animated, but were only small (cm's in length), because the nanobots had not been working on them long, an accident happened. Their babysitter washed them.
All the nanobots were killed except one, which cannot replicate itself as a result. The nine Robowiggy children are now being built, molecule at a time, by a single nanobot which is shared between, passed from one to another during playfighting. It has been predicted by the Great Wiggy that the completion of the nine RoboSquirrel's will not occur for another 1 213 366 years, but when it does it will be fantastic.