* Cats with many toys tend to be poor mousers ( a cat that eats its kill).
* Pampered and well-treated cats tend to be poor mouse killers.
* Cats with shorter attention spans are poor mouse killers.
* Males are less likely to be killers than females.
* Younger cats have not yet developed their "killer instincts".
* An non-spayed cat can be too easily distracted from mouse killing.
* House cats are less likely to be killers than feral cats.
* Well-fed cats tend to be lousy killers.
* Cats not rewarded for their efforts (by their owners) will lose the incentive to become a mouser.