I've watched tons of tying videos on tying intruder type and spey type flies. I've collected a few materials suitable for spey hackle and intruders that provide long fibers. My current supply has a bit of amherst center tail feather, ostrich herl in several colors, pheasant tail and body feathers, some probably low quality mallard and teal, blood quill maribou, turkey shoulder feathers and a few blue eared pheasant feathers. What, if any other feathers are you all using for your long intruder fibers or spey hackles. I'm currently enjoying the tying of sparse flies that have a larger profile. (I don't have any Rhea as of yet, but I do have that on my list of materials to try). Now that my tying space is somewhere warm I'm going to try to tie a few different things each night. Thanks for your input (and possible sources if you are willing to share).