Behavior
Guinea pigs are generally very smart animals. One way in which they are smart is that they know how to get you to give them what they need. A guinea pig can show agression, barbering, begging for food, biting, biting the cage bars, coprophagy, depression, freezing, licking, mating dance, mounting, nose sniffing, nose nudging, popcorning, running away, scent marking, scratching, sleeping, streching, and understanding you. When a guinea pig shows one of these signs, it will make itself quite clear as to what it wants you to do for them.