What's the most dangerous invasive species?

An invasive species might look harmless but if not controlled it can destroy an ecosystem. In this top 10 we take a look at ten of the worst. read more

The black rat is most likely one of the first invasive species to ever be inadvertently distributed by humans. The species originated in tropical Asia, but is believed to have reached Europe by the first century A.D. before spreading across the world, hitching rides en masse on European ships. read more

An invasive species might look harmless but if not controlled it can destroy an ecosystem. In this top 10 we take a look at ten of the worst. An invasive species might look harmless but if not controlled it can destroy an ecosystem. read more

The NRDC advocates closing the routes that invasive species often use to hitchhike into the country, while the U.S. Fish and Wildlife Service, under the Lacey Act, regulates what people are legally allowed to bring in to the U.S. "The costs of invasive species are so high, literally hundreds of billions of dollars a year," Cmar says. read more