&gt; so everything is more or less &quot;invasive&quot;.<p>That&#x27;s simply not true. I&#x27;m not so familiar with the fauna of Hawaii, but you can consider the moa which was happily ensconced in New Zealand for about 20 million years, and extinct within 200 years of the Polynesian settlement in the late 13th century. It&#x27;s pretty clear to me in a situation like that what was native and who the invaders were, and I&#x27;d be surprised if the situation in Hawaii were very different.