A plague of frogs -- and other invasive species

If you're been reading at all about biodiversity loss, you know that there are five main causes to the present crisis, all of which are human-induced: habitat fragmentation, pollution, over-exploitation, introduction of invasive species and climate change. You may know that the dodo didn't go extinct because it was poorly adapted to its environment on the island of Mauritius; it went extinct because it was over-hunted by sailors and because the introduced rats, pigs, dogs and cats ate its eggs, which were laid on the ground.

Here's a list of 10 other species introductions that have gone awry, a reminder that we really don't understand ecosystems very well.