Info on cats. Taken from Tidbits of Rolla, October 31, 1996 edition
In a study, 18 kittens were raised in the company of rodents. Only three
of these cats later on became rodent killers. The other 15 could not
be induced to kill rodents even when they watched other cats doing it. They
considered rodents family rather than prey. And the three rodent-killers
refused to kill rodents of the same species they had been raised with.