What Carb for Poly Stroker

So what I'm reading is roos are pretty much worthless.
Must be like Sandhill Cranes. I had mentioned a field east of Saskatoon, Saskatchewan, Canada where Sandhill Cranes stop.yearly during their migration. A whole 1/4 section moving with them searching for throwover grain kernals. An indigenous fellow was standing there and said, "you can boil those useless things gor three days and they are still too tough to eat".