Guess what the sparrows often do by flapping their wings in the sand? This behavior is mainly for cleaning feathers. The cleanliness of feathers is undoubtedly very important for the sparrow's flight, warmth and body protection. Therefore, sparrows will find sand and use the action of flapping their wings to clean their feathers and keep themselves healthy and comfortable.
Answer: Clean feathers
Knowledge expansion: The behavior of sparrows flapping their wings in the sand is often called "bathing". This is because sparrows' feathers may be covered in dirt or bitten by parasites, and this sand bath helps them remove dirt and parasites from their bodies.
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