These creatures can "punch" with such force that they can shatter aquarium glass.

Government officials in New Zealand are investigating how an aggressive species known as the “thumb splitter” ended up in the country’s northern coastal waters. Researchers out trapping ...

Government officials in New Zealand are investigating how an aggressive species known as "the thumb splitter" ended up in the country's northern coastal waters. Researchers out trapping Asian ...

Getty Images/iStockphoto Government officials in New Zealand are investigating how an aggressive species known as “the thumb splitter” ended up in the country’s northern coastal waters.