This, along with the behavioral and ecological factors mentioned above, makes island species more vulnerable to extinction.

These extinction mechanisms are common for island endemic species.

Even the island species, which have restricted ranges, are described as common within their ranges.

Mainly, these are island species that have evolved specialized traits.

Typically for isolated island species, they were reported to have been friendly and unafraid of humans.

There is a limited amount of habitat appropriate for island species.

In it, he studied 116 island species and compared them to their mainland varieties.

Their pelts were so blue they seemed black - the island species, different from mainlanders.

Like many island species they were also reported to have been friendly and unafraid of humans.

As humans traveled around the world they brought with them many foreign animals which disturbed these island species.