Scientists have discovered a prehistoric rat as large as a human living in the Amazon rainforest about 10 million years ago.
This giant rat weighs 80kg and is up to 1.5m long. It is the largest rodent that ever lived in South America.
Scientists say it is most likely the ancestor of modern giant guinea pigs. They live in wetlands, which later becomes lush forests.
With this huge size, they have very few enemies in the wild. It is thought that their rare enemies are large crocodiles, waiting for giant mice to pass by to attack.
They are named by biologists Neoepiblema ac Greensis. This species possesses two giant front teeth while the brain is strangely small weighing only about 114 grams.
This can be explained by the fact that the living environment is good, not many enemies make them not need to be too smart.
Fossil ancient mouse species found in Acre, Brazil. The skull is so well preserved that the scientists were astounded.
There are more than 2,000 species of rodents – almost half of all different mammals on Earth. These include mice, beavers, squirrels, porcupines …