Turkey/Ostrich
Fly tying ostrich feathers are essential for tying scuds and Ray Charles as well as tiny midges and streamers too. Fly tying turkey flats are excellent for doing up-right wings on baetis patterns, makes a very refined alternative for most para-posts.
Emu Feathers, Spey Plumes, Premo Turkey Flats, Ostrich Herl, Turkey Biot Quills, and Mottled Turkey Quills are all must haves for any serious fly tier.