What do beads and feathers mean on the shoshone Indians?

Red Feathers sybolize physical vitality, good fortune and life. This is the basic symbolism I could find. Now I'm not neccessarily trusting the source of this answer.

In Native American culture the overall symbolism is derived through how the feather came into your possession. Ie) found it, a bird left it for you, you pulled it from a bird.

So it depends on the type of bird, how you got it, whether it was in a dream or awake etc.