How small a hole can a mouse get through? Experiments.

Experimenting with how small a home a mouse is able to fit through. But it didn't go as planned. I had a lazy mouse, and a hard working invading shrew.
http://woodgears.ca/farm/mouse_hole.html
Update: Two days later, the shrew squeezed itself through the 16.5 mm hole:
https://www.youtube.com/watch?v=ifCgW1Q_rto
Caption:
My mouse maze from last year had this 19 millimeter hole that the mouse got. through without problems, but i wonder. how small a hole can a mouse get through. and if that most makes it through all. these holes i can just slide that over. and force the mouse through even smaller. holes. i put some peanut butter in front of the holes as well as in the holes and. in the compartments behind. and i've got my raspberry pi 2 with a camera module watching it. now i just have to wait for a mouse. so the critical diameter is somewhere. between 16 and 17 and a half millimeters. so have to make some holes of those. sizes and i'm using my pantorouter. for those odd sized holes. i know the mouse can get through that one. what i'm testing is half a millimeter smaller and one millimeter smaller than that. i'm adding more peanut butter to make it. more tempting for the mouse. so it'll actually try those holes. finally it went in a hole but i already knew it could do that one. it seems the mouse wasn't even trying the smaller holes but added more peanut butter just. to make sure the mouse kept coming back. oh no no i've been infiltrated by a mole. but actually it's just as shrew, but still. not what i was looking for. well i guess this one's a little bit too. big to take away the mouse bait. and the mouse is back but i think that. most has just gotten lazy or maybe i fed. or maybe i fed it too much already. well at least that shrew is trying to get. into holes. that hole is too small just give it up. holy crap i wonder if it is. make it back out. no way the mouse never tried to go through that hole. i left the experiment running for a few. days after that and the shrew kept going. through the same holes but never the. smallest one. .
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