Once they do that by definition are they not Feral anymore?
Feral cats can be tamed. Some take longer than others.
Ding - Ding - Ding
I think we have a winner.....
feral
fe·ral or fe·rine
adjective
Definition:
1. gone wild: describes animals or plants that live or grow in the wild after having been domestically reared or cultivated
feral cats
2. savage: similar to or typical of a wild animal, or living wild