And if the rat is killed with Warfarin [1], then maybe he'll be eaten and the anti-coagulant will then harm the next animal in the food chain..
What a horrible idea - feed a chemical which will make an animal hemorage internally.
That's way out there.
That's human ingenuity...
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Links:
[1] http://en.wikipedia.org/wiki/Warfarin
[2] http://smtp.realneo.us/system/files/warfarrin-rat-killer-is-non-selective-P1550500.jpg