I've seen them. I know what they look like, and often catch them whizzing across the road at weasel warp speed.
But their size always surprises me. Every time. I know they are small. But when you look at a picture of a weasel or think weasel, you think bigger. You don't think "oh, a weasel. That's a little bigger than a hamster that is". Or I don't. I go, ooooh a weasel. Wow, it's tiny, every time, the surprise never abates.
I struggle with weasel physics. That the actual weasel is not the size of the concept of weasel in my head.
I'm not sure how to fix it. 