The starling imitates other birds. The bird call can mimic starlings when they are in a group in flight or nesting. Hold the bird call by the central part, with a good grip, holding the outgoing pipes between the thumb and forefinger. Shake your hand, a bit like when you play table football. Very easy to use.
See video below.
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Video: French Francois Morel shows here how the bird sound is produced. Francois Morel is an ornithologist and has been producing bird calls since 1975. Read more about the production of bird whistles.