Cited by 15Marine animal studies overviewWildlife Ecology and ConservationAvian ecology and behavior

Animal-borne acoustic data alone can provide high accuracy classification of activity budgets

Open access
Thiebault, Andréa, Huetz, Chloé, Pistorius, Pierre, Aubin, Thierry, Charrier, Isabelle·2021·Animal Biotelemetry

Abstract

Background: Studies on animal behaviour often involve the quantification of the occurrence and duration of various activities. When direct observations are challenging (e.g., at night, in a burrow, at sea), animal-borne devices can be used to remotely record the movement and behaviour of an animal (e.g., changing body posture and movement, geographical position) and/or its immediate surrounding environment (e.g., wet or dry, pressure, temperature, light). Changes in these recorded variables are related to different activities undertaken by the animal. Here we explored the use of animal-borne acoustic recorders to automatically infer activities in seabirds. Results: We deployed acoustic recorders on Cape gannets and analysed sound data from 10 foraging trips. The different activities (flying, floating on water and diving) were associated with clearly distinguishable acoustic features. We developed a method to automatically identify the activities of equipped individuals, exclusively from animal-borne acoustic data. A random subset of four foraging trips was manually labelled and used to train a classification algorithm (k-nearest neighbour model). The algorithm correctly classified activities with a global accuracy of 98.46%. The model was then used to automatically assess the activity budgets on the remaining non-labelled data, as an illustrative example. In addition, we conducted a systematic review of studies that have previously used data from animal-borne devices to automatically classify animal behaviour (n = 61 classifications from 54 articles). The majority of studies (82%) used accelerometers (alone or in combination with other sensors, such as gyroscopes or magnetometers) for classifying activities, and to a lesser extent GPS, acoustic recorders or pressure sensors, all potentially providing a good accuracy of classification (> 90%). Conclusion: This article demonstrates that acoustic data alone can be used to reconstruct activity budgets with very good accuracy. In addition to the animal’s activity, acoustic devices record the environment of equipped animals (biophony, geophony, anthropophony) that can be essential to contextualise the behaviour of animals. They hence provide a valuable alternative to the set of tools available to assess animals’ behaviours and activities in the wild.

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  • Wearable acoustic tags can capture vocalizations, movement-generated sounds, and environmental noise, enabling automated inference of behavioural states such as flying, diving, or resting from acoustic patterns alone.

    “Wearable acoustic tags can capture not only vocalizations but also movement-generated sounds and environmental noise, enabling automated inference of behavioural states such as flying, diving, or resting from acoustic patterns alone”

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Research works printed but not linked: 2

  1. Puttick GM. Foraging behaviour and activity budgets of Curlew Sandpi- pers. Ardea. 1979;67:1-122.
  2. Mullers RHE, Tinbergen JM. Parental provisioning behaviour pre- dicts survival of cape gannet chicks under poor conditions. Ardea. 2009;97:89-98.

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Authors
Thiebault, A., Huetz, C., Pistorius, P., Aubin, T., & Charrier, I.
Affiliations
  • Nelson Mandela University (ZA)
  • Centre National de la Recherche Scientifique (FR)
Corresponding author
Thiebault, Andréa
Venue
Animal Biotelemetry
Published
2021-08-14
Volume
9
Issue
1
ISSN
2050-3385 (ISSN-L)
OpenAlex
W3193334884
Cited by
15
References
131
Citations by year
2026: 3 · 2025: 4 · 2024: 6 · 2023: 1 · 2022: 1
FWCI
1.08
Type
journal article
Language
en
Open access
Locations
  • Animal Biotelemetry (publishedVersion, cc-by)
  • HAL (submittedVersion)
  • HAL (submittedVersion, other-oa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Nelson Mandela University Research Repository (submittedVersion)
Funders
  • National Research Foundation
  • Centre National de la Recherche Scientifique
  • Nelson Mandela University
Topics
  • Physical Sciences › Environmental Science › Ecology › Marine animal studies overview
  • Physical Sciences › Environmental Science › Ecology › Wildlife Ecology and Conservation
  • Physical Sciences › Environmental Science › Ecology › Avian ecology and behavior
Keywords
seabird foraging behavior, Cape gannet, k-nearest neighbors, biophony, geophony, anthropophony, animal-borne sensors, accelerometer, GPS, pressure sensors, bioacoustics

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