The Common Blackbird possesses the most melodious voice in the avian world, according to new research that examined the relationship between human hearing and birdsongs. A study published Tuesday in "Frontiers in Bird Science" found that the blackbird's song is perceived as the most pleasant due to its optimal performance across key acoustic metrics: frequency (pitch), amplitude (volume), and song structure (complexity).
In the study, 84 participants evaluated the vocalizations of 123 bird species, rating them on a scale of one to five. The Common Blackbird achieved the highest score at 4.52, while the barn owl received the lowest score of 1.32.
Dr. Nadine Kalb of the University of Tübingen in Germany, the study's lead author, stated that appreciation for birdsong is not contingent on recognizing the species. "Being able to recognize birds by their appearance or song did not affect how people rated calls," Kalb said. "This suggests that enjoyment of birdsong is connected to something more fundamental than just knowing what you are listening to."
Scientists identified 21 bird species whose vocalizations were characterized as "restorative," meaning they reduced stress and calmed participants. Listeners generally favored songs with narrower bandwidths and greater complexity, preferring intricate melodies with moderate amplitude and frequency over harsh or excessively quiet sounds. Kalb suggested that humans might be predisposed to prefer such variable sounds with moderate amplitudes and frequencies as they may signal a safe, healthy, and restorative environment conducive to relaxation.