I have had a female 3700gm girl slide her tub to very close to getting out on a feeding day. I was watching, so I know I didn't leave it open. I have a AP rack lidless clearly. I have drilled holes in the front of each tub and put a golf T in them so the tubs cannot side past the T. My little bugger has figured it out so if I leave the T out for long she has the tub moving...
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