in the waters I fish for trout there´s a bunch of crabs that look like the one in the pictures. They let themselves drift in the water and can swim and hide underneath rocks.
In my local fly shop they have very good crab imitations but made out of something that looks like stuffed cloth, more or less like a teddy bear. Its kind of rigid and it cannot mimic a swimming motin.
The closes thing for imitating it a real crab is a olive woolly bugger. Its tail action more or less imitates the crabs swimming motion, but I was wondering if theres any closer pattern that looks more like a crab and can actually mimic a swimming motion. Thank you