I was cleaning black walnuts the other day and noticed something odd when I was dumping the water I washed the nuts with...worms...not in the shell, nightcrawlers...lots of them coming out from the ground where I dumped the water. Why is this odd? It was the middle of a sunny afternoon. Black walnuts contain alot of tannin. This isn't the first time I've seen this...suppose I'm just a little slow...never put two & two together. Anyway, seems the worms don't like the tannin. So I did a little experiment. I went back & grabbed a can, filled it with water, dropped in a couple of the hulls, then let it sit for a minute or two. I grabbed a can of fresh water too & headed for a spot next to the wood line. I dumped part of the fresh water on one patch & the tannin tea on the other. Within minutes, there were a half dozen worms coming up in the tannin tea patch...nothing where the plain water was. I poured some of the tea on the plain water spot & sure enough out came the nightcrawlers. Cool! This gives me a real easy way to catch worms. I'll save some of the hulls to make up some tea next time I go fishing & need some bait. Don't know yet if the worms need to be washed off before using them to get rid of the tannin taste / smell. Guess I need to go fishing to find out.