No they did NOT post signs. This is NOT a ranch it is a house in the suburbs ... no livestock is allowed here. The houses back up to the San Jouquin river where there is a lot of wildlife ... ALL of it protected. Once again domestic cats are NOT recognized as predatory animals in the sense that the law refers too anymore than my neighbors teacup poodle is.
Are the cats preying on protected wildlife? It sounds dangerous for the cats to be out roaming around in that area.
DOMESTIC CAT PREDATION ON BIRDS AND OTHER WILDLIFE
And: The Rights (and Wrongs) of Cats
According to [California] Fish and Game, stray cat populations threaten a litany of endangered species: California clapper rail, San Clemente Island loggerhead shrike, Pacific pocket mouse, riparian brush rabbit, salt marsh harvest mouse, Alameda whipsnake, and California least tern.