I don't own them but my girlfriend does! One little girl called Willow and three boys, called Pippin, Poppin and Squeaker (I believe! As they can't tell them apart very well anyway

)
Funny story I could tell you about, its rather rude too though

When I was at my girlfriend's house, sleeping over for a few weeks, we were all in the living room chatting. Her boy's degu cage was beside the living room door in the kitchen and her dad was standing beside that door, which the chair I was sat in is. Anyway! We were chatting and all of a sudden my girlfriend calls out in the room "put your willy away!" and because her dad was standing beside me and she was looking straight at him, I thought she was talking to her dad! lol! I was so shocked I spun round and noticed one of the degu boys was cleaning his willy and we all burst out laughing! lol! There's definately NO mistaking which is which gender! lol!