Every time I approach my rabbit cages I use the same tone of voice and the same words. They begin relating that noise to getting treats or feed. This habit came in handy this morning because five of my six week old Rabbits had escaped their cage. Every one of these Five rabbits responded to my words and tone and came back to me from the brush! I was able to capture everyone of them and return them to my cage. I highly recommend doing this in case of an emergency.