What type of sound does a guinea pigs make?

Piggies make a variety of sounds. The most common are 'mutters' which sound just like the piggy is talking to itself quietly....no one really knows why they do this but it's normal. They will also squeak, both quietly (just to complain, if their mates are bothering them, or if you do something they don't like), and they will squeal really, really loudly, this serves almost entirely to get YOUR attention (if they're hungry, thirsty, lonely). They will also make a low 'purring' sound, which seems to be a sign of relaxation, or contentment, such as when they are being pet, or just happy.

a squek