The fossilized skull of a rat the size of a car has been found in Uruguay. It’s about 4 million years old and weighed about a ton, so big, in fact, that it probably spent most of it’s life submerged in water: a giant Hippo with a long tail and pointy nose. 
They nicknamed it Mighty Mouse.
Apparently, the largest living rodent now is Capybaras at 60 kg fully grown…now, that’s a meal.

And here’s a new reason to travel to New Guinea:
Where’s my passaport0?
Chow. 