“Measuring 53 centimeters (21 inches) long, the skull was found in Uruguay by an amateur fossil hunter among fallen cliff rocks in the San José region. Analysis of the bizarre find by paleontologists suggests it belonged to a bull-size species, which has since been named Josephoartigasia monesi,” National Geographic News reported.
The megarodent lived in lowland rain forests between two and four million years ago, perhaps using its massive teeth to fend off saber-toothed cats and giant, flightless, meat-eating birds, researchers said
The newfound species was reported in a study led by Andrés Rinderknecht of the National Museum of Natural History and Anthropology in Montevideo, Uruguay.
The previous holder of the title world’s largest rodent was a ”buffalo-size” fossil creature from Venezuela, revealed by scientists in 2003.
read more: http://newswatch.nationalgeographic.com/2009/02/04/biggest_animals_of_all_time/