by Diana Filer
5. Castor gras is the beaver fur which resulted after American Indians wore the skins as clothing with the fur close to the skin. With time the outer guard hairs wore off, leaving the soft inner fur which was called “castor gras”. This fur was prized by the French fur traders who shipped it back to Europe to be made into stylish beaver felt hats. It had a major role in opening Canada to European exploration.