Ethel is having some bunny discourse with her pen's gate. They all have done it, although not necessarily on the gate. The pen is 7'x7' (this is where they reside when no one is home; otherwise the gate is open). They will go up to a wall of the fence and tug on it with their teeth; now that I think about it, it seems they only exhibit this behavior when they are outside the pen, looking in. Lucy could really raise a racket; if we made her stop, she'd just go back to it after we sat back down.