I stopped using using rabbit a while back. Not because it doesnt work (as a matter of fact they work well.), but because its difficult to find rabbit hair thats long enough, or more importantly, find hide that isnt as hard as a rock. The hide tanning process they use apparently varies greatly, because if the hide is too thick, or wasnt tanned correctly, the jig has bad action. Im also a big believer in different types of hair/fur on the same jig. A real crawfish has several parts on his body moving at different speeds. Mouth parts, legs, antenna, claws...all with different action. Plus, every type hair/ feathers has a different degree of robustness. For craw imitations i use Marabou, Arctic fox, and my new favorite raccoon. Raccoon seems to have the best of both worlds,action plus durability. I agree with with Al on the bucktail
Then there are minnow imitation hair jigs. This is where I most always use a small strip of fine bucktail on the top of the back. It gives it a spine and flows more naturally like a Ned rig almost. Have you noticed that all marabou crappie jigs bend 90 degrees in the middle when falling? the small amount of bucktail prevents this. Bucktail is another thing that is difficult to find good ones. Too many Northern Bucks instead of Southern Does. For my jigs the hollow body aspect of bucktail is not what i want.