As a student of ecology I sometimes come across words that are conspicuous by their absence; words that have not yet been invented. Here is such a word:
antisynurbism – noun: (pronounced: anti-syn-urb-ism) To act in an antisynurbic way. Cats, dogs, rabbits ect. returning to a feral or semi-wild state but happy to remain in an urban environment living alongside and scavenging from humans may be said to be antisynurbic or displaying antisynurbism. Opposite to synurbism.