Lol, they are real characters!!
Mine have a particular squeak that they use soley for me - it's a demand really, an 'oi, let us out!' squeak.
I have also noticed that they like me to be there when they come out, they seem insecure if I'm not with them. I'm very fortunate and my degus live in a conservatory (which gets no sun whatsoever so it's always nice and cool' so occasionally I let them out to play whilst I'm doing something else as I can keep an eye on them through the French windows that connect the living room with the conservatory. Whenever I do that though, they all end up back in their cage with the door still open. The minute I go in there they all come running out and usually sit on my knee. They will sit on my knee for ages. I think I'm their favourite toy......
They are trained to go back in the cage when I rattle a plastic box containing pumpkin seeds, as soon as they hear the rattle they go in the cage and wait to get a seed. This has proved to be very handy!!!
I love 'em to bits.