Hi Carp,
Just a few ideas.
black bear - Wings on any type of fly. Underfur for wirey dubbing on big nymphs.
caribou - spun hair for small irresistibles.
boar - bristles for antennaes, tails, legs or perhaps wrapped bodies.
dall sheep- excellent for spinning and trimming for coffin dry flies
moose- tails, wrapped bodies
Just make sure the materials are clean.
Allan