Re: "the use of rules which allow you to specify the action"
"A rule that releases the hungry lions. Yes, that would work."
Don't laugh, in some countries they do exactly that. Training cats has it's own issues, however, one big cat can replace several dogs, so for heavier-duty guard duties, they do well.
Feeding them can be a bit costly, they do go through a LOT of meat...
Biting the hand that feeds IT
