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White-browed Scrub-Robin Song Helps Map Amboseli’s Bird Soundscape

White-browed scrub-robin singing from a branch
Research · Ecology

A multi-year acoustic survey in Kenya’s Amboseli ecosystem is using the song of the white-browed scrub-robin (Cercotrichas leucophrys) to help identify birds in long recordings. Biodiversity Research Institute (BRI) presented the work in its May 2026 e-zine.

Wet- and dry-season recordings track a changing soundscape

Field teams placed autonomous recording units at selected sites and paired the recordings with systematic bird point counts. During a point count, observers remain at a defined location and record the birds they see or hear during the survey, providing a direct field reference that can be compared with what the recorders capture. Data were collected in both wet and dry seasons. This makes it possible to compare not only which species are heard in different parts of the ecosystem, but also how the overall soundscape changes as environmental conditions shift through the year.

The white-browed scrub-robin received special attention because it is a prolific singer and, according to BRI, a major contributor to Amboseli’s bird soundscape. Its frequently repeated whistled melody contains a complex sequence of rapidly rising and falling pitches. On a spectrogram—an image showing how sound frequency changes over time—these pitches appear as a recognizable pattern of upward and downward strokes. BRI describes the melody as distinctive to the species and therefore a reliable sign of its presence in a recording.

Automated classifiers narrow the search

Finding one species in many hours of audio is still a demanding task. The project’s bird-sound specialists therefore build automated acoustic classifiers. Rather than listening through every recording from beginning to end, the classifiers examine spectrogram images and isolate candidate sounds for experts to review. The final identification remains connected to human checking, while automation narrows the amount of material that must be inspected.

BRI reports that analysis of the recording-unit data revealed several surprising species, including birds that are rarely observed. The combined seasonal recordings can provide information about movement and seasonal presence across Amboseli. The resulting Amboseli Seasonal Bird Soundscape is intended as a resource for land managers, conservation organisations and people interested in birds, with the broader goal of strengthening monitoring and helping direct protection efforts.

Sources and image credit

  1. McEntee, J. (2026, May). The sounds of Amboseli. One Drop of Water, 4(2). Biodiversity Research Institute.

Image: Derek Keats — singing white-browed scrub-robin at Mkhuze Game Reserve, South Africa, 17 August 2011. Wikimedia Commons/Flickr; representative image, not from Amboseli. Cropped to 16:9. · CC BY 2.0 — https://creativecommons.org/licenses/by/2.0/ · Source

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