Full concept modification of S.T.A.L.K.E.R. Call of Pripyat that touches every game aspect including textures, sfx, music, weapons, AI, items, weather, mutants, difficulty and much more.
You can loot skins/hides/pelts from most mutants.
You can even trade these among other Stalkers.
Crows are now also lootable.
See earlier upload about the Mutant Hunting submod here:
Diversity of 'parts/items' that you can acquire through mutant hunting counts a dozen of various meat chunks, a dozen of hides and another dozen of special parts like hands and legs.