Giant Capybara
The largerst rodent is the cabybara.
Is a rock rabbit a rodent
the biggest is a capbabery and it lives in Africa
The Beaver
the biggest rodent in the mammal family
Giganotosaurus
anaconda
Xiphactinus
A capybara! Its big! look up some pics of it on google.com
i found out today ^_^. a mosasaurus
The biggest prehistoric fish ever is a megalodon(Bigger than the present day Blue Whale,and bigger than 2 great whites put together.)Great Whites:16 ft. :)
capybara is the answer. it's the size of a small dog and is a close relative of the Ginni pig.