Mice plague and bird deaths

["Tony Keene" <>]

Just been doing a spot of research and I wonder why the companies that make the 
mouse and rat poison don't include trace amounts of denatonium benzoate - 
apparently birds can detect it at much lower concentrations than rodents. If it 
was included in the formulation, it would deter birds from eating the posion 
baits and might even be present in rodent corpses in enough concentration to 
deter birds from eating those as well. In case you're wondering what the stuff 
is, it's also known as Bitrex and is the bitterest substance known - 10 parts 
per million can make something inedible to people and they use it in antifreeze 
to stop kids drinking it.
 Cheers,

 Tony