Practise, practise and more practise, when you get bored from failing so much, buy a Whistle.
In my opinion, if the chicken had lips, then yes, it could whistle. But then again, how would it learn to whistle? Someone would have to teach it. And why would a chicken want to whistle anyway? To show off to the other birds? Or maybe it would cheer him up on a gloomy day. . . nah! Could a chicken whistle if it had lips? I guess the world will never know. . .
First you lick your lips and blow softly. And don't give up.
Lips
No, it couldn't, because chickens don't know how to whistle!
You do not even need your lips to whistle. They actually produce poorer quality pitches than if you don't use your lips. You use your tongue and arc it up/down to change the pitch of the whistle and push a tight hole of air through your teeth.
LIP
It depends, I can whistle through my front teeth and its not like they are strangely spaced.
Yes probably so!
That is the correct spelling of "whistle" (a sound or a noisemaker, or to make sound or music with the lips).
They can, but it is the males that are more likely to learn to whistle.
Air travels through the whistle rubbing against the sides of the whistle than being forced out of the smaller opening at the front. The friction of air against the sides of the whistle is what makes the noise.
Pretty much dry lips or loss of muscle tone in the lips. Loss of muscle tone in the lips could be meds or could be the indicator of a minor stroke