Corners. The worms love to congregate in the corners. This is normal. Besides crowding together for warmth, the worms and beetles are also thigmotactic. That means liking and needing to be in contact with their own kind with as many of their surfaces touching each other as is possible.
When I first learned that word, I thought it was so neat I told the first person I encountered which happened to be a young man who had come to my house to clean the chimney. When I told him the word and what it meant, he got excited and said he was going right home and tell his girl friend that he was thigmotactic.

I'm definitely with the right crowd!! lol