I have been hearing about the Missouri nightcrawlers here latley and decided to find out the difference. I went to Judys Bait Shop and she said she was bought out and only had the Canadian ones. So I bought a dozen and caught nothing, besides a drum. This morning after the rain stopped. I went to the river and dug up about 2.5 dozen of the Missouri nightcrawlers. What I did notice is they were a lot more active and really plump. (By the way digging them up is no fun at all) Now wether or not the cats know the difference I will soon find out. I am starting to believe there will be a difference. I here to much of how people use them for Flatheads, and do well. I am use to using gills. Now last night I was fishing on the Meramec and had a gill and a wad of worms ( Canadian ) on seperate poles but casted them in the same area. About an hour later the gill pole went down with a 5 pound flatty. Not saying he passed up the Canadian nightcrawlers for the gill but nothing but a drum was caught on the crawlers. What are you thoughts??