Why the "Thumb Splitter" Is a Concern. Known for their aggression, Japanese mantis shrimp have earned their ominous nickname ...

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.

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 ...