I know how to check how long the feeding tube is by measuring from the beak to the crop on the outside and marking it. My question is, how do I know I'm in the crop and not in the lungs? On a human I would push in air and listen for a gurgle, does this work on a chicken? while inserting the tube, are their any tips for head positioning that will help ensure I pass the tube through the right location. Again, in a human I know I have them bend the head forward to ensure the airway is closed, does this apply to chickens.