I had one escape without realizing it. I discovered the escape because I heard crabbing in the other room. I went to check it out and saw 2 kittens chasing a glider across the kitchen floor. I then saw a glider turn around, raise her arm, crab and chase 2 kittens the opposite way! I was glad it wasn't my adult cat because I may be less 1 glider. I must say that was the funniest thing I have ever seen!