The Syrinx: The Secret Behind Birds’ Songs

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HomeEarth and SpaceBiologyThe Syrinx: The Secret Behind Birds' Songs

The melodic songs of most birds have a soothing quality, making them pleasant to listen to. These distinctive sounds are produced by a specialised structure called the syrinx.

A complex organ

The syrinx, also known as the avian lower larynx, is an intricate structure composed of bones, cartilage, and soft tissue. It is situated at the point where the trachea divides into the bronchi, which lead to the lungs. Typically, the syrinx features a resonance chamber and vibrating elastic connective tissues, known as tympanic membranes. Sound is generated when muscle contractions push these membranes inward. The syrinx resonates at a frequency below a millisecond.

Some songbirds are capable of producing more than one sound at a time. Endoscopic techniques and high-resolution 3D imaging have allowed ornithologists to discover that some birds have the ability to control the lateral and medial labia of the syrinx, creating an effect known as lateralization:

‘Each side of the syrinx receives its own motor program, which, along with the program sent to the respiratory muscles, determines the acoustic properties of the sound produced ipsilaterally’1.

birds
Photo 1. © Source: Canva.

Scientific ‘explanations’

‘Scientists are not sure how or why birds evolved these unique larynxes.’2

‘Why only birds evolved a newly localized sound source in this location remains unknown, and hypotheses about its origin are largely untested.’3

‘The anatomy of the complex physical structures that generate [bird] sound has been less well understood’4.

The syrinx, first found in the fossil record, is a fully formed syrinx5. Recent explanations of its supposed evolution are not very convincing:

‘The longer trachea of birds compared to other tetrapods likely predisposed them to evolve a syrinx.’3

The phrase ‘likely predisposed’ lacks scientific precision and does not constitute a valid explanation. Similarly, the same publication refers to ‘strong selective pressures,’ which is also not a scientifically rigorous statement.

Chad Eliason, an evolutionist from the Field Museum of Natural History in Chicago, devoted to the peculiar idea that thick-tailed theropods somehow became hummingbirds, stated:

‘If we were to find fossil evidence of a syrinx in dinosaurs, it would be one of the indisputable pieces of evidence, but we haven’t yet. In the meantime, we must look for clues in other animals.’2

Searching for the syrinx in other animals

The search was unsuccessful, as reported in the Proceedings of the National Academy of Sciences. To explore the evolution of the syrinx, an interdisciplinary team of evolutionary morphologists, developmental biologists, and physiologists examined the tracheae of birds, mice, cats, salamanders, and crocodiles. The results indicate that the syrinx is a unique evolutionary phenomenon.2

Time and chance or design and purpose?

The syrinx has no evolutionary history. It appears to have been intentionally designed to operate at super-fast speeds, producing beautiful music among God’s works of nature.

By the way, we recommend reading the articles:


Footnotes

  1. Suthers, R. A. 1997. Peripheral control and lateralization of birdsong. Journal of Neurobiology, 33(5), pp. 632–652.
  2. Birds’ voiceboxes are odd ducks. ScienceDaily. Published on sciencedaily.com 24 September 2018. Accessed 12 October 2021.
  3. Riede, T. et al. 2019. The evolution of the syrinx: An acoustic theory. PLOS Biology, 17(2), e2006507.
  4. How do songbirds sing? In 3-D! ScienceDaily. Published on sciencedaily.com 8 January 2013. Accessed 12 October 2021.
  5. Clarke, J. A. et al. 2016. Fossil evidence of the avian vocal organ from the Mesozoic. Nature, 538(7626), pp. 502–505.

Based on: F. Sherwin, “The syrinx song,” Acts & Facts, Institute for Creation Research, August 2019, p. 15.

© Source of main image: Canva.

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