Mike,
Jim Krul had an article in Fly Tyer about pheasant tails, including a PT nymph tied with an ostrich herl thorax. I tied a few up, using dyed brown ostrich herl, and they worked very well. I have been tying them that way ever since. Another variation that I use sometimes is a short emerging wing of white Zelon or Neer Hair.
Steve

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"If there are no dogs in Heaven, then when I die I want to go where they went"-Will Rogers