How do i make my mobs defend villages?

I want my new mob Inquisitors and hunters only to target animals and hostile mobs.  it would be ideal if they do not target animals that I have in my farms. I also want them to search for villages and hang around them when they find one. Basically they should act like villagers They are made so when they make a kill that they have chanced of spawning villagers and another inquisitor or hunter.