Agree Ian, They are so good at body language to be honest I use very few whistle or voice commands now only doing a few for practice, I have to be careful with the ecig as she will sometimes sit or come when she see's me raise it to my mouth. When I used to work my dogs 4 or 5 times a week I rarely gave commands they knew the job better than me lol I first found this out after forgetting to take my whistle one day 2 hours into the day I realised I really didn't need one anymore. Sometimes whilst night flighting duck or geese I would think I missed a bird but the dogs would disappear off with out command returning with a bird, there senses and abilities never fail to amaze me