Wow, an amazing video featuring the Rusty Rat. Some awesome narration to go along with the fly.
Somewhere about 1935 Joseph Clovis Arsenault was asked by Joseph Pulitizer to replicate a worn out Black R.A.T. that had the under body showing through. This better with age and well used fly was the birth of one of the most famous of all Canadian hair wing flies.
Defiantly one of my all time favorite salmon flies to tie and fish. Enjoy!