yep like the cord holes at the top of a reptile one enclosure!
or thru the gap between the glass sliding doors LOL
You would be surprised how often this happens. They can flatten themselves and push through between the glass, and other tiny spaces you wouldn't think they can get through
Fold up some newspaper, and wedge it in between where the sliding glass doors join. Make sure it is in there firmly.
We had one little bugger who was able to push the newspaper out of the way.
Also, maybe consider housing them separately? That will pretty much assure you will never again have to worry about one eating the other.
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