I find my mice to be very intelligent, for a small animal. I’ve heard it said that they are more intelligent than hamsters and gerbils, though we don’t get those here so I can’t say from personal experience. When I enter the room, my mice will almost always pop out to say hello and often rally at the cage door waiting to be paid attention to. I have heard of people training their mice to do simple tricks, come to their names, etc with the use of large amounts of repetition and treat rewards. I haven’t done this myself as I prefer my mice to behave as they want to, not as I think is cute. Remember, mice are used in laboratories all over the world to study behaviour, run mazes, hit coloured buttons that lead to food – all this indicates a certain level of intelligence.