They were still small when I took their pics; more fun and lovely as pets than hamsters (we had a Syrian hamster once). Compared to hamsters, they don't bite but nibble, not too tiny to play with; and they don't run too fast and escape.
More about cavy (Cavia Porcellus) at http://en.wikipedia.org/wiki/Cavy. As quoted in there, "Despite their common name, the animals are not pigs, nor do they come from Guinea."
Click 
[