I have round containers(can-o-worms)and it seems to me that they do Like the edges. But that's a very small sample.

Dave Nelson

Mine congregate around the edges of square bins. I have no idea why.

The Can of Worms even has the airholes evenly on the bottom. If your worms are doing the same thing, I can stop feeling guilty the middle of my container does not have enough air.

Maybe the plastic is like the smooth inside of egg shell. Or do they do the same in wood boxes?

I have not really thought about that one. I just see them everywhere in the bins. (worm factory)