This practice is really a mudra, but we regard it as a pranayama practice because of its close similarity to sheetali and sheetkari pranayama.
The word kaki means ‘crow’. This practice is so called because, during inhalation, the mouth is shaped like a crow’s beak. In English it is usually called ‘the crow’s beak’. It is also said that regular practice of this mudra leads to a disease-free, long life that is often associated with the crow.
Shape of the lips
During inhalation the lips should be shaped as shown in the following picture. The two lips should be pursed together leaving a small tube through which the air may be inhaled. The tongue should be relaxed.
Sit in a comfortable asana.
Place the hands on the lap or on the knees.
Keep the eyes open throughout the practice.
Do nasikagra drishti by fixing both eyes on the nose tip.
Try not to blink the eyes.
The first round starts here.
Purse the lips.
Breathe in slowly and deeply through the mouth.
At the end of inhalation close the lips.
Exhale through the nose.
The first round is completed at the end of exhalation.
Do more rounds.
Remember, the eyes must be kept open throughout the practice and there should be continuous practise of nasikagra drishti.
For lull details on awareness, benefits, duration and other aspects of the practice see below.