The sweet song of birds heralds the start of spring
18.05.12
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Songbird facts
Songbirds make up over half of all bird species and produce complex, rhythmic vocalizations that resemble musical melodies:
1. Bird song originates in a syrinx located at the base of the windpipe where it branches into two tubes that enter the lungs.
2. The syrinx is a bony chassis encasing thin membranes, stretched and relaxed by tiny muscles.
3. Air vibrating the membranes in combination with muscles tensing and relaxing the membranes produces whistles, songs, chirps, buzzes and calls.
4. Anatomical mechanisms in the bronchi and trachea augment the bird's songs and calls.
Songbirds can sing with closed beaks, because songs are shaped inside the syrinx, not in the oral cavity as with humans.
Not all birds sing
Birds such as red-bellied woodpeckers make a variety of sounds and calls but not usually rhythmic melodies.
Male woodpeckers make a "drumming" sound by hammering their beaks on tree trucks, housing eaves and chimney flashings to attract a mate.
Source: Houston Chronicle