Hubertus Hazelhen calls

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A good, durable call. It sometimes gets "clogged" with saliva, causing the sound to resemble something completely different from the target bird, but a sharp puff of air in the opposite direction helps.

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Sounds right; its functionality remains to be verified.

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A classic. Works once you learn the technique.

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The sound imitates begging very well. Also successfully imitated the squeaking of mice. However, it may become "hoarse" quite quickly from the water vapor when blowing for longer bursts.

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A working whistle and a catch about 10 minutes after whistling

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Works as it should. The birds answer

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A bit thin and gets blocked when I blow it myself.

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A relevant product please whistle. The sound is soft rather than loud.

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Quite OK

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Works well.