Watch this experiment on mice squeezing through tiny holes

Woodworker Matthias Wandel has mice in his workshop, and he wanted to see how small a hole mice could crawl through. But after setting up his ingenious little test, a challenger appears: the wily shrew!

Bonus video: he set up a plank bucket trap but did not put water in. It's interesting how the mouse keeps falling for it immediately after escaping.

How small a hole can a mouse get through? Experiments. (YouTube / Matthias Wandel)