This tree is an Asian import that grows fast, spreads fast, damages ecosystems and crop land, and is very tough to eradicate. It stinks, too.

Tamarisk, or salt cedar, is a highly invasive plant that has caused plenty of problems in the West. A test project to control the pest with the tamarisk leaf beetle has been underway since 2001 in parts of the country, but a few of the beetles have turned up unexpectedly in the upper end of the Grand Canyon. Will this prove to be a case of "Oh, my," or "Oh, me"?

Federal officials are finally fast-tracking efforts to eradicate Burmese pythons from the Everglades. If this can be done, and that’s a very big if, it will take teamwork, technology, hard work, and good luck.

Do you want to see a LOT of zeroes?

Those tiny mussels called Quaggas cause major problems in lakes and rivers, including those in national parks, and they're spreading across the country. If you think this won't affect you, better think again.

Breeding populations of Burmese pythons have been established in Everglades National Park and some other parts of Florida. Limiting the growth and spread of this ecologically disruptive, potentially dangerous invader will be a daunting task.

The Asian swamp eel is prolific, hardy, voracious, ecologically disruptive, and on its way to becoming the scourge of the Everglades. Is it already too late to stop it?