Rats and certain other vermin are difficult to kill with poisons because their feeding habits reflect their place as scavengers. They will eat a small bit of something and wait, and if they don’t get sick, they continue. A good rat poison must be tasteless and odorless in lethal concentrations, and have a delayed effect.
There are several types of rodenticides available. The traditional products are called anticoagulant rodenticides and are discussed here. If one intends t…