It's not unusual to have a pet rodent, but Melanie Typaldos' pet Caplin Rous is no ordinary rodent. See, Caplin is a Capybara, the world's largest rodent:
The second part of his name, which Typaldos pronounces like "rose," stands for "Rodent of Unusual Size" (a reference to the movie "The Princess Bride"). He's also a rodent of unusual abilities. He can walk on a leash and even do some tricks, but Typaldos says it's important not to exaggerate any similarity to a dog doing tricks.
"Dogs have thousands of years of being trained to be subservient to people," she says. "A capybara will not do a trick just to make me happy. The quality of the trick is very dependent on the quality of the treat."