I don't know what happened to the original poster? I also don't know what animals are in the San Diego area - but when you search online; they list deer/mule deer. Deer have a sweet tooth for beans. It is almost impossible to discourage them after they get their first taste. About the only cure is to put your garden in protective custody - fence it in.
Rabbits and groundhogs also love beans. I did not see any groundhogs listed for that area. I would be more than willing to send some out that way! I don't see why we should suffer alone back east!