Extended data:
The vocal organs of birds are called vocal tubes.
First, the movement of airflow causes the taut sounding membrane to vibrate, and then the sounding membrane periodically blocks the sounding tube, thus forming a periodic pulsating airflow and making sound. Another view is that the airflow forms turbulence in the narrow part of the sound tube, producing a whistle-like sound.
Birds have two bronchi. Many researchers believe that each bronchus has its own pronunciation system, just like a duet in vocal performance. So it is not surprising that birds can make melodious and changeable sounds.
Different kinds of birds have different numbers and functions of vocal muscles. Non-songbirds, such as ostriches and egrets, have simple singing pipes, so there is basically no singing; Such as thrush, lark, oriole, lovebirds and other songbirds have four or five pairs of vocal muscles to adjust the tension of vocal cords, so they can emit melodious songs; Cranes have long, circling horns, just like the horns of saxophone, so their calls are loudest and can travel far, so there is a saying that "cranes listen in the sky"
Sparrows live at an altitude of 300-2500 meters. Regardless of mountains, plains, hills, grasslands, swamps, farmland, low hills and foothills, all kinds of forests and shrubs mostly live in sparse forests, shrubs and grasses on the edge of forests, and do not like dense forests. The environment is the same as most birds, so the song is similar to other birds.