Scientists have identified the birds whose calls can match the noise of industrial equipment. A study published this week in Evolution sets baseline volume measurements for more than 100 bird species and names the bare-throated bellbird as a leading contender for the loudest bird known to science.
The South American bird produces calls at decibel levels comparable to a chainsaw or jackhammer. Its cousin, the white bellbird, reaches similar acoustic intensity. The red-legged seriema, also from South America, matches their audible power.
The Research Foundation
Reporting by Meghan Bartels describes the study as the first comprehensive framework for measuring avian vocalizations across a broad range of species. Until now, scientists lacked systematic data on how loudly different birds sing. This baseline matters: it lets researchers assess whether extreme vocalizations reflect evolutionary adaptations to particular environments or mating behaviors.
The bare-throated bellbird can make chainsaw-level noise, though it weighs far less than the machinery it matches acoustically. That raises questions about the physical mechanisms that let such a small creature produce such intense sound.
What Drives Extreme Volume
Male birds don't produce loud calls by accident. They typically sing loudest during breeding season, when competition for mates intensifies. In dense forests like Brazil's Atlantic Forest, where the bare-throated bellbird lives, volume can give a bird an advantage: louder calls travel farther through vegetation and make more impact on potential mates.
A video of a male bare-throated bellbird singing in Brazil's Atlantic Forest captures the phenomenon in its natural habitat. Researchers can compare those real-world vocalizations with laboratory measurements to better understand the ecological conditions behind such extreme acoustic output.
Why This Matters:
Understanding animal communication strategies shows how evolution can optimize biological systems for maximum effect with minimum material cost. The bare-throated bellbird produces industrial-level noise with a body weighing a fraction of a chainsaw. This research gives future studies of avian vocalization a baseline, potentially informing wildlife conservation priorities and acoustic ecology research. Which species reach extreme decibel levels matters to habitat preservation researchers, too: these birds may need specific environmental conditions to maintain their competitive edge in natural selection. Systematic measurements across 100+ species also set clear standards for researchers to reference, improving the reliability and reproducibility of ornithological studies. We've got a baseline to build on, and it's based on more than 100 species.