Moo didn't hang out and play with the other kittens much.  She had a very unique and distinguished personality.  She acted like royalty and usually wanted to be with people.  As soon as she was big enough to climb up on the bed with dad, that's where she stayed most of the time.  Friskie was more independent and stayed outside a lot.  Moo became a much better companion for dad, so we kept her.  Little did we know that Friskie had gotten pregnant a second time while still nursing the first litter.  There were cats galore that summer, and Moo kept nursing with the second litter.  Enough was enough, so Friskie and Moo both got spayed ASAP.