Two versions of Jim Cope’s nymph for the Callibaetis. The top is the ‘original’ (my original copy cause I was not sure what to use) dressing: coastal deer hair tail, tannish gray Hare’s Ear dubbing (you can include a very fine copper rib, or 2# mono) and a deer hair wing. This is a very good nympy in general. The deer hair tail and wing are less durable (after many fish) than a feather barbs tail (partridge, teal, mallard let’s say) and a antron wing. The next picture is the same pattern except here I tied it with a partridge tail and a CDC wing. The general pattern lends itself to slender swimming nymphs and whatever variation seems fitting for the nymph/insect you are imitating.