Many of O’ahu’s native bird species are gone. The Polynesians and westerners brought in too many invaders: pigs, rats, mongoose, cattle, goats, chicken and, worst of all, avian malaria-transmitting mosquitoes. Island ecologies are notoriously fragile. and the Hawai’ian Islands proved to be no different. Today, native bird species, especially O’ahu’s amazing songbirds, are mostly gone.…