If you are left handed and this initial positioning feels awkward or uncomfortable, then adjust your hand positioning accordingly and invert “right” and “left” instructions described for this process. [2] X Research source
When you curl the fingers on your right hand, they will slightly wrap around the outside of your left thumb. This might cause your right thumb to rest lower than the left, so you might have to lower your left thumb to make them level. [5] X Research source
If you only hear air passing through your hands and no whistle, double-check to make sure your hands are sealed. It might take some practice to master this technique, so don’t get discouraged. You can change the pitch of the whistle by adjusting the hollowed area of your hands. Making the area smaller will create high-pitched whistles, and making the area larger will create low-pitched whistles.
Don’t be discouraged if you don’t create a sound on your first couple of tries. This technique can take a lot of practice to master. You can create a fluttering bird call by rapidly opening and closing your fingers, or by changing the size of the hole between your thumbs. [8] X Research source
Thicker or shorter blades of grass will create low-pitched noises, and thinner or longer blades of grass will create high-pitched noises. [10] X Research source
Blowing in bursts will create a “fa-fa-fa” sound, and blowing continuously will create a warbled effect. [13] X Research source