Leeches are often considered a staple for stillwater fly fishers. How often we actually see leeches is interesting to contemplate. Other than in B.C. lakes, I have not seen leeches in the shoreline muck and detritus of the lakes I fish, yet I (you?) profess to imitate them all the time. I think it is more of a regional thing, I am sure I spend little enough time really looking.
But, hey, should you actually find some and contemplate collecting them, here is an interesting few things to consider about leeches at The Museum of Ridiculously Interesting Things. Some creepy things at this site. Don’t blame me.