Good job - you have poisoned the rats, and any critter that eats them. Dogs, cats, birds like owls, foxes etc. all will eat the bodies, and then get poisoned themselves and die. While rats need to be controlled, poison is NOT the way to go. Get yourself some rat-sized snap traps. Bait them with bacon. They are effective and do not poison other critters. If you have dogs or other pets that go outside, be sure to pick up the dead bodies (with gloves or a shovel) and dispose of them securely.