The cows know they are supposed to follow the truck to get fed. They don't know what size a truck is supposed to be. Kind of like Jerimiah Johnson's elk didn't know how many feet a horse is supposed to have.
My Daddy was wrong when he said: "When a man turns 60 he ought to be able to trade his testicles in on a new set of teeth." Oatmeal and soup don't sound too bad.