Hey Wayne, moving the houseboat in Knowles Canyon the other day because of falling water my grandson called me over to look at a crayfish that was working like heck to get at the meat in a mussel. He finally made it and discarded the shell. Couldn't tell if it got all the mussel out but it had a good sized chunk when it let go of the shell. Is this the norm? If so hooray for crayfish, those shores where the water has come down from last year are covered with the shells.