Why my guinea pig does these sou..

Brief：
a worried squeakinga burr of displeasurehttp://www.guinealynx.info/media/chloemo...exactly that my guinea pig does. but why?? why on Earth?? I thought.. 

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a worried squeaking

a burr of displeasure

http://www.guinealynx.info/media/chloemo...

exactly that my guinea pig does. but why?? why on Earth?? I thought he liked being in my hands, but now I see a meaning of his burring sound.

Guinea pigs communicate with both sound and body language. When walking around together in the cage, or on the floor, they will often times squeak and grunt as they move about, which is a sign of general contentment. If a guinea pig, particularly a baby, gets lonely, it will squeal loudly, asking for reassurance. Guinea pigs that are housed alone will often make this sound, requesting human contact from their owners. The guinea pig will also squeal loudly when it suspects that food is on the way. This begging for food is reserved exclusively for humans.

Guinea pigs also squeal when they feel that they are in danger, which acts as a warning to others in the herd. This squeal is typically more panicked than the squeals for attention or food, and several squeals may be emitted in rapid succession.

When you pet a guinea pig, you will often times begin to hear it squeak or grunt, or even coo softly. These are sounds of contentment and pleasure, are are one of the main reasons why guinea pigs are so adorable as pets. If, however, you touch an area that they don't like (such as the sides of the tummy in a pregnant female, or the very bottom of any cavy), you might hear a rumbling sound, which serves as a warning. This rumbling is also made by guinea pigs when they hear sounds that they do not like (such as your upstairs neighbors banging on the floor, or a sharp snare drum on the radio), or when they want to warn others when something "isn't quite right".