Do you ever have trouble with rats? I'm not talking about the human type, I'm talking about the little buggers that get into the attic and drive you nuts?
Where I live virtually everyone has rat problems. Not something well known to people thinking of moving into the area.
A few years ago I was at the county fair and stopped to speak to someone at a booth giving out info about mosquitos and rats. Fun booth to work, huh? When I asked about rats they immediately said, "Oh do you live in...?" I stared at her and said, "Uh, no. Are they known for their proliferation of rats?" We then discussed the county wide problem and I made a note to not visit the town mentioned.
I'll admit that I don't like killing the little creatures. I don't find them all that ugly, but I also don't like having them in my walls, especially when they start squeaking. And considering how many cats and owls are in this neighborhood I'm surprised there are any rats. The lizard population has certainly taken a nosedive, but then that might be due to agricultural pesticides. Don't get me started on the lack of frogs.
So is K-R-O still made? This vintage magazine ad is from the 1936 October The American Magazine. You'll notice that they say the product is made from Red Squill. After reading a bit about Red Squill I find their claim of "Kills rats without poison" a little dubious. You can read about all of this to your hearts content here and here.
As far as human rats are concerned...they're best ignored.
And alas, no information given about the illustrator of the rat. I'm just sayin'.