That second pic is the inside of the half-eaten zucchini you can see in the first pic. This one is unusual in that he hollowed out the center. Most of the others I've seen disappear were eaten radially from the outside in.
Anyone ever have this problem before? Know how I can stop it?
My Dad used to pour some cheap beer in a tin and put it out in the garden. For some reason the slugs were attracted to it. They'd die a slow and happy death.