1. Insolent invaders

2. Slitherin' snakeheads

3. Got crabs?

4. Super swine

5. Too many blooms

6. Bogus buckthorn

7. Argentine ants

8. Weed of a 1,000 leaves

9. Weed-beater success story


Image of feral pig courtesy USGS Pacific Islands Ecosystems Research Center


Wanted dead, not alive INVADING SPECIES Feral pig, Sus scrofa. Photo:Pig on its haunches, slobbery with mud or dung. With aliases: Wild boar, wild hog...


Often smaller than barnyard swine, the wild boar makes a living by digging soil to eat worms, roots and other delicacies. This fast reproducer is smart and none-too-choosy about grits. Here's how the National Park Service puts it:

"The pig, a secretive, highly adaptive opportunist, seeks and destroys native plant communities without regard for rare or endangered status. Rooting and rutting, digging and degrading, pigs eliminate endemics, and spread and fertilize aliens."

With red body and long, curved beak, bird looks to the left. In Hawaii, pigs helped cause the extinction of 63 bird species once found nowhere else. More than half of Hawaii's endemic ("found nowhere else") bird species are dead, helping make the islands the world's extinction capital.

This honeycreeper is one of the group of birds that alien species are killing in Hawaii. National Park Service



Disrupts native vegetation and "plows" soil for plant seeds. Plops a dollop of "natural fertilizer" on weed seeds. Wallows become breeding grounds for mosquitoes. Reward for capture: Bacon, pork chops, bristles, pigskin.


More information



This rose don't smell so sweet, ecologically speaking.




  The Why Files  

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