Scientists say the largest ever rodent probably used its huge front teeth like tusks, defending itself and digging with them instead of just biting food. The bull-sized cousin to the guinea pig died out around two million years ago. Read more
The fossilised skull of the largest rodent ever recorded has been described by scientists for the first time. The remains of the one-tonne beast, found in Uruguay, indicate that it would have been as big as a bull. It is thought that the three-metre-long herbivore would have roamed estuaries and forests 2-4 million years ago.
Fossil hunters have uncovered the greatest rodent that ever lived -- a one-tonne behemoth that bestrode the swamplands of South America four million years ago.