Alien species in Pacific threaten birds

The United Nations has declared 22 May the International Day for Biological Diversity. This year's theme is "Alien Invasive Species". These are not species from another planet, but animals, plants and other organisms that are not native to a country or an island but come from somewhere else. In the tropical Pacific region, the list of such alien invaders is long but some of the common ones are rats, ants, mongoose, and weeds like mile-a-minute.