Adressing the ear. Most of the time there are trap- sterilize- and release programs that trap feral kitty's sterilize them and in order to mark them as sterilized they nip off the tip of the ear. Sounds like what happened here. Your female is feral, the male is not. Either way you have a kitty you can love on and 2 that will work for their living. They have a job that is suited to their personality's and species. Keep them cooped up to get them adjusted to their new home and keep that poison up. Your kitty's are the best defense against rodent's you can get! Once again I thank you for giving that girl the home she needed.