The biggest rodents: CAPYBARAS
If you don't know what a capybara is, go to http://gianthamster.com/
Capybaras are harmless rodents about the size of a labrador. Most of them live in the wild, while some are kept as pets. If you think any other animal beats the capybaras' amazingness, post what animal and why you think it exceeds capybara awesomeness.
P.S. I only made this debate in honor of Caplin Rous the capybara.