Well... He hates them. He drives them away every time he sees them. I mean, he likes Biba very much, but she was never pregnant.

Because you have many female cats in and around your house, and this handsome boy is inside sometimes, you should have him fixed (neutered) so you don't have many, many more kittens running about who will get sick and suffer. And throwing him down from a high wall was not good...he might have a broken leg.