Yep, broadcasting Diphacinone in Hawai`i endangers lots of animals because they will end up ingesting the poison as it works it way up the food chain.  It's a "persistent organic pollutant" which means it doesn't break down, and gets stored in the bodies of animals, which causes it to concentrate as it moves up the food chain - eventually to humans by the way.  So all that "Hawai`i Fresh"(TM) fish may kill the subsistence fisher's (and hunter's) kid.  And it can kill the very birds they profess to want to save.
Thanks for the update Teresa.