The first time she did it she was just a baby, last year when I first got her. She also eats alot in her house where I can't see so she's probally done it more than twice. I breed my own rats and always have plenty, I gradually increase size. I tried to go the next size bigger last week and she refused,put the next size down and she ate it right up. She's always been a funky eater from day 1,but she always eats so I can't complain.