[JoeAltmaier]

That's a symptom of ecological upset too. One species flourishing when another dies off, and the resulting wild cycles. Not a good sign.

[gerbilly]

Here's a good article on that topic:

Planet of weeds Tallying the losses of Earth’s animals and plants By David Quammen/Harpers Magazine

http://courses.botany.wisc.edu/botany_422/readings/Quammen19...