Dear Jansy,

      “Peterson’s grouse” is a reference to the late Roger  Tory Peterson, the author of the long-time  standard guide to North American Birds. There is no “Peterson’s Grouse, however.

Alan P. Peterson’s book is  long post-VN. 

       Long ago,I published an article entitled, I vaguely recall, “The Birds in Nabokov’s Ad”a in an obscure Festshrift for Dean S. Worth.

 

Best, Don