My babies each have their own unique sounds and one doesn't sound at all like the other one. I do have to tell you that the other day my daughter and I almost freaked out. Duncan was barking at me (the only time he does this is if I am on my phone and ignoring him) and all of a sudden he made a noise that sounded exactly like a very, very deep "Mama". My daughter and I looked at each other and said "did you hear that?" "Did he say Mama?" About an hour later, he made the exact same sound when he was trying to get my attention. Since then he has done it numerous times and every single time he makes it, it sounds exactly like "Mama"! It is just the cutest thing