The trio came to live in her back yard in urban Chicago as part of the Cats at Work program created by Tree House Humane Society as an effective solution to the serious rodent problem typical in most densely populated cities.
None of that presented a problem when cats lived on whole wild rodents and small birds; but it is a seriousproblem when cats are fed convenient dry kibble biscuit diets or un supplemented meat, poultry or fish.