We've talked about invasive species a lot on MNN, and most of the time the stories highlight the resulting problems. For example, rabbits, cane toads and camels introduced by early settlers are wreaking havoc on the ecology of Australia. The Great Lakes are under siege from zebra mussels. Florida wildlife officials are battling non-native Burmese pythons. Anytime an exotic animal is brought into a new environment, it frequently ends badly, but there are some places where that's not the case. In Hawaii, non-native birds are helping native shrubbery to survive. In the Southwestern U.S., typically invasive kudzu is helping a native bird dodge extinction. Rebecca Tuhus-Dubrow, a writer for Slate, uncovered many examples of foreign plants and animals being a good thing.