Duck-billed dinosaur It grows up by an enemy's 3X.

A kind of the large-sized herbivorous dinosaur called the "duck-billed dinosaur" which inhabited the present North American Continent at Late Cretaceous Period (67 million to 80 million years before) was understood that growth was quick 3 or more times compared with the meat-eating dinosaur of a natural enemy. Since anything does not have "arms", such as an angle, it is said that it is thought that it opposed by becoming large early from a partner intently. Research teams, such as U.S. Ohio University, announced to the electronic edition of an English royal association bulletin by the 9th.
Duck-billed dinosaur It grows up by an enemy's 3X.