So, being a new rat owner I was wondering about some noises my ratties are making. I have three males (father - maybe 10 or 11 months old now and two sons - unknown ages) that I got in August from the local Humane Society. One of the younger ones, Benny, seems to have a little sneeze sometimes. It's kind of a 'pftht' sound. Although once in a blue moon the others also make a little noise too. They do this when they are all running around exploring and foraging. I almost think the little noise is a way to communicate that they found a treat or something. Do rats 'talk' to each other like this? or do they have some sort of respiratory cold?