Full headdresses are worn by Plains Indians men who have earned a place of great respect within their tribe.
They are seen as items of important spiritual and political significance.
Sometimes worn into battle, warriors who were first in line and returned home safely would earn one eagle feather.
Each feather in an honored person's possession has to be earned through acts of incredible courage and honour on behalf of the tribe, or gifted to them in gratitude for their hard work.
In the United States, eagles are protected birds under the Migratory Bird Treaty Act of 1918, and only enrolled members of a Native American tribe may legally possess them.
Some warriors might be awarded only two or three honour feathers in their whole lifetime, so difficult are they to earn.
Enjoy these beautiful Indian Chiefs skulls with full headdresses: