This signals aggression or agitation. If your guinea pig’s teeth chattering is accompanied by baring of teeth, it is your pet’s way of telling another guinea pig to stay back or back off.

In a new study, a team led by Pamela Yelick, a professor at the Tufts School of Dental Medicine, has successfully grown bioengineered teeth in pigs using a combination of human and pig cells.

Guinea pigs are known to be gentle, social creatures that thrive in calm, caring environments. However, because they are prey ...