'Bombing' the Galapagos with Poison?

Ecuador is apparently dropping 22 tonnes of specially formulated blue-pelleted (said to appeal only to rats) poison on Darwin's Galapagos Islands (http://www.guardian.co.uk/world/2012/nov/15/ecuador-poison-galapagos-islands-rats?INTCMP=SRCH). The hope is to eradicate rats (inadvertently introduced by sailors in earlier times) that are decimating island populations of endemic reptiles and birds. Hawks and Iguanas have been temporarily re-located for the duration. It's amazing how frequently conservation efforts boil down to pest (as defined by humans) eradication! The prognosis is not particularly good as the participants note that, if even one pregnant female survives, the whole process will have to be repeated again and again.