
About ten years ago I had a rat problem as many people did that year. I didn't want to use rat poison because of my dogs and cat, but couldn't get them in traps and they were multiplying. My feed store guy told me about E-Raze. It's made by the company that uses the third category. Their poisons contain zinc phosphide which produces a gas in the stomach and kills the rats. Less danger to cats, dogs, and such because they can throw up, rats can't, and it's not a systemic poison. What I'm wondering if something like this would pose a lower threat to the hawks than the anticoagulant types. The way I understand it that is doesn't get/stay in the tissues of the rat. ??? I will say I had quite the "herd" out there and within 24 hours not one. I'm sure it killed some, some was probably taken to their home and killed more, but when the rats have a death problem the others will leave the area. I was amazed.
I found this telling the three categories of poisons at http://www.epa.gov/oppsrrd1/reregistration/rodenticides/finalriskdecision.htm
Differences Among the Rodenticides - The ten rodenticide active ingredients covered by this action can be divided into three categories:
first-generation anticoagulants: warfarin, chlorophacinone, and diphacinone;
second-generation anticoagulants: brodifacoum, bromadiolone, difenacoum, and difethialone; and
non-anticoagulants: bromethalin, cholecalciferol and zinc phosphide.
The anticoagulants interfere with blood clotting, and death can result from excessive bleeding. Bromethalin is a nerve toxicant that causes respiratory distress. Cholecalciferol is vitamin D3, which in small dosages is needed for good health in most mammals, but in massive doses is toxic, especially to rodents. Zinc phosphide causes liberation of toxic phosphine gas in the stomach.
The second-generation anticoagulants are especially hazardous for several reasons. They are highly toxic, and they persist a long time in body tissues. The second-generation anticoagulants are designed to be toxic in a single feeding, but since time-to-death is several days, rodents can feed multiple times before death, leading to carcasses containing residues that may be many times the lethal dose. Predators or scavengers that feed on those poisoned rodents may consume enough to suffer harm.
The "rat/rodent killer" I got was through Motomco http://www.motomco.com/p_products.htm




I still have mine from years ago somewhere. 