Biomechanics

Birdsong can tell bird size

Print edition : March 27, 2020

An analysis of a bird species’ unique rasps shows how sound fluctuations in birds’ songs might reveal details about birds’ body sizes. Photo: Gonzalo Uribarri, Physical Review Letters (2020)

THE white-tipped plantcutter is a reddish small bird that emits a distinct hoarse groaning sound. It is not a vocal learner, meaning it has little motor control over the sounds it makes. Instead, the bird relies mostly on biomechanics to sing its rasp. Now, researchers studying the biomechanics of the white-tipped plantcutter’s rasp have determined how to gauge the bird’s size through its vocalisations. An Argentinian and German team of scientists, led by Gonzalo Uribarri of the Institute of Physics of Buenos Aires at the University of Buenos Aires analysed recorded birdsongs and employed computational models to assess song segments. They found a relationship between the frequency of resonating sounds from birds’ oro-esophageal cavities and birds’ sizes. The scientists also checked the correlation between song and size by testing museum specimens. The results suggest that the biomechanics of bird sounds could potentially be used to predict bird size. The work was recently published in the journal “Physical Review Letters”.

A letter from the Editor


Dear reader,

The COVID-19-induced lockdown and the absolute necessity for human beings to maintain a physical distance from one another in order to contain the pandemic has changed our lives in unimaginable ways. The print medium all over the world is no exception.

As the distribution of printed copies is unlikely to resume any time soon, Frontline will come to you only through the digital platform until the return of normality. The resources needed to keep up the good work that Frontline has been doing for the past 35 years and more are immense. It is a long journey indeed. Readers who have been part of this journey are our source of strength.

Subscribing to the online edition, I am confident, will make it mutually beneficial.

Sincerely,

R. Vijaya Sankar

Editor, Frontline

Support Quality Journalism
This article is closed for comments.
Please Email the Editor