But researchers say alien species are now entering this tropical paradise at many thousands of times their natural rate, causing critical problems.

In recent years, this species also entered the pet trade.

The registry was live on 10 August 2006 with 1.5 million species entered.

As of 2011, there were no reports of the species having entered trade, but it is highly sought after by collectors.

In the early 1990's, however, the species at large entered a general decline, even as commercial fishing was further restricted.

Protected species such as bats may enter the trap and not be able to leave it again.

On average a new invasive species enters the Great Lakes every eight months.

The species apparently entered the country in a shipment of used tires from Japan.

The American mink has a long body, which allows the species to enter the burrows of prey.

The European species did not enter into the herbalists' pharmacopeia.