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www.reference.com/article/dog-whistle-work-af8f6fe8b8bd4770

Dog whistles exploit the difference between the hearing range of a dog and that of a human. They use a pitch that is too high for humans to hear but is high enough for dogs to hear. Longer whistles have lower pitches, so in order to get a higher sound, dog whistles use a very short tube (only about

www.reference.com/article/whistle-20ac5a7895a0b5d5

To whistle, moisten your lips and say “ooh." Hold the tongue back, and gently blow a constant stream of air through your pursed lips. Adjust the position of your lips, and repeat the process until you create a whistling note.

www.reference.com/world-view/people-whistle-ca7ac6ede598c2b3

A study carried out at the University of Chicago surmised that people whistle to distract the brain from overload. This suggestion came from a study into the phenomenon of choking carried out by a leading Psychologist Dr Sian Beilock.

www.reference.com/article/cat-whistle-bc24a0a6731480b0

A cat whistle is a high-pitched whistle used for training a cat not to misbehave. However, using a cat whistle too often can also cause the cat undue stress.

www.reference.com/world-view/make-silent-dog-whistle-e46eb9f2eff71874

Silent dog whistles can be made from carving willow branches. The branch used should be about 3/4 inch thick and 8 to 10 inches long, cut at an angle.

www.reference.com/article/whistle-mouth-f9d8bffd0d8e5b02

Whistling Tom explains that the first step in whistling with your mouth is to put the tip of your tongue against the roof of your mouth. The air that flows between the roof of your mouth and the top of your tongue is what dictates the note that leaves your lips.

www.reference.com/article/whistle-fingers-ff0977b8d35270fd

To whistle with your fingers, place the tips of two fingers into your mouth and under the tip of your tongue. Close your mouth and blow hard to make a loud whistle.

www.reference.com/article/whistle-two-fingers-c4c40ca1fec80d02

To whistle with two fingers, cover your bottom teeth with your lower lip, put your pinkie fingers into your mouth, and curl the tip of your tongue. Take a deep breath, and blow the air across the tip of your tongue.

www.reference.com/article/can-whistle-loudly-ea8d610c1f71c7d7

To whistle loudly, place the first two fingers from each hand together, fold your lips over your teeth, press your tongue back with your fingers and lightly blow. Practicing is the most important step in mastering the skill of loud whistling, so don't be discouraged if it doesn't work immediately.

www.reference.com/article/whistle-lips-6756ddc2ff749660

Closing the lips to form an "O" shape is the first step in whistling. The tongue should be against the ridge of the mouth's roof, and the lips should be tight. Experiment with the mouth, but maintain the whistling position. Wet lips and blow slowly.