Predation by brown treesnakes resulted in the complete loss of most forest birds on Guam. Reintroduction of extirpated bird species to Guam is currently dependent on creating zones where snakes have been eradicated or greatly reduced. Protecting nesting structures is an additional method that could be used for some species, particularly cavity nesters. The Federally endangered Guam Micronesian Kingfisher is a cavity nester that is extinct in the wild and restricted to U.S. zoos. Working directly with this species on Guam is no longer possible, but Micronesian Starlings (listed as endangered under Guam law) are also cavity nesters and a small population has survived. Efforts to develop snake-resistant nest structures for the Micronesian Starling would not only help this species expand its p