2024Typically Dutch - Songbirds - First Day Cover

Songbirds Of all the bird species in the world, 60 per cent belong to the songbirds. Songbirds do not use vocal cords for their singing like humans, but rather a special organ (syrinx) at the end of their trachea. Bird experts distinguish between calls (shorter sounds to sound the alarm or seek contact, for example) and songs (to defend a territory and attract potential mates). Birds produce their song by vibrating both cartilages and membranes, which is controlled by very fast muscles. The beak also plays a role. The song of each bird species is unique, allowing conspecifics to recognise each other. Bird lovers classify bird songs according to determination or song keys, such as rollicking song, motive song, strophic song and continuous song.