Further Reading: Chapter 22 — Birdsong Monitoring and Environmental Surveillance

1. Krause, Bernie — The Great Animal Orchestra: Finding the Origins of Music in the World's Wild Places (Little, Brown, 2012)

Bernie Krause is the founder of soundscape ecology as a scientific practice — he began recording natural soundscapes in the 1960s and has amassed one of the largest personal libraries of field recordings in existence. This book is his accessible account of what soundscapes can tell us about ecological health, how natural acoustic environments are structured, and how human-generated noise is degrading them. Essential reading for understanding why bioacoustics matters beyond its surveillance applications. Krause writes beautifully, and the book's central argument — that we are losing acoustic worlds as fast as we are losing visual ones — is urgently relevant to environmental monitoring discussions.

2. Pijanowski, Bryan C. et al. — "Soundscape Ecology: The Science of Sound in the Landscape" (BioScience, 61(3), 2011)

This foundational academic paper formally established soundscape ecology as a scientific discipline and defined its core theoretical frameworks. Available through academic databases. Pijanowski and colleagues articulate the acoustic niche hypothesis, introduce the key acoustic diversity indices, and outline the methodological toolkit for soundscape analysis. Essential background for understanding why passive acoustic monitoring generates scientifically meaningful data — the paper situates PAM within a coherent theoretical framework rather than treating it as simply a species-counting exercise.

3. Kahl, Stefan et al. — "BirdNET: A deep learning solution for avian diversity monitoring" (Ecological Informatics, 61, 2021)

The peer-reviewed paper introducing the BirdNET system and evaluating its performance across species and recording conditions. Available through academic databases and on arXiv. This paper provides the technical documentation of BirdNET's architecture, training data, and performance evaluation — essential for understanding both the system's capabilities and its limitations. The accuracy analysis is particularly valuable: it shows how BirdNET's performance varies by species, recording quality, and geographic context, providing the evidentiary basis for the evidence evaluation framework in Chapter 22's main text.

4. MacArthur Justice Center — "ShotSpotter: Unreliable Evidence, Racially Biased, and Prone to False Alerts" (2021)

Available free at macarthurjustice.org. This is the most comprehensive independent analysis of ShotSpotter's performance in Chicago. The report analyzes 21 months of ShotSpotter alert data, documenting the 89% false positive finding, the geographic distribution of deployments, and the racial demographics of communities most affected. Essential reading for students who want primary-source documentation of the chapter's claims about ShotSpotter accuracy and geographic concentration. The report includes the data sources, methodology, and raw findings — making it suitable for methodological analysis as well as substantive reading.

5. Katz, Vikki — "ShotSpotter's Troubled History" (Motherboard/Vice, multiple articles, 2021)

A series of investigative articles documenting ShotSpotter controversies in multiple cities, including the Michael Williams case detailed in Case Study 22-1. Available online at vice.com/motherboard. The investigative series provides documented cases of ShotSpotter's failures, the company's responses, and the legal and political consequences. The Williams/retroactive reclassification story is documented in "How ShotSpotter Changed a Gunshot Alert to Help Prosecutors" (July 26, 2021) — the single most important piece for understanding the algorithmic authority problem in acoustic surveillance.

6. Merchant, Nick D. — Monitoring Marine Environments with Acoustics (Acoustical Society of America, 2019)

A technical overview of passive acoustic monitoring in marine environments, covering the instrumentation, deployment, and analysis of ocean acoustic data. Provides accessible explanations of how cetacean monitoring works, why ocean acoustics matter for conservation, and how anthropogenic noise affects marine ecosystems. Essential context for understanding the marine dimension of environmental acoustic monitoring discussed in the chapter. The treatment of time-difference-of-arrival (TDOA) localization is directly relevant to understanding the same technique used in ShotSpotter gunshot localization.

7. Sullivan, Brian L. et al. — "eBird: A citizen-based bird observation network in the biological sciences" (Biological Conservation, 142(10), 2009)

The foundational academic paper describing eBird's design, data model, and scientific applications. Available through academic databases. This paper explains how eBird handles observer bias, validates data quality, and transforms volunteer observations into scientifically defensible population trend estimates. Reading it alongside the chapter's analysis of eBird as "surveillance" creates a productive tension: the paper demonstrates the genuine scientific value of the system while its architecture — as described in the paper itself — exhibits the structural features the chapter attributes to surveillance systems.

8. Noss, Reed F. — "Indicators for Monitoring Biodiversity: A Hierarchical Approach" (Conservation Biology, 4(4), 1990)

A classic paper establishing the theoretical justification for systematic biodiversity monitoring — what indicators should be used, at what scales, and why. While predating the PAM era, this paper provides the scientific framework within which passive acoustic monitoring is situated. Understanding why biodiversity indicators matter helps students evaluate whether the surveillance apparatus of environmental monitoring is proportionate to its scientific and conservation purpose — a necessary step before concluding whether the privacy costs are justified.

9. Amoore, Louise — The Politics of Possibility: Risk and Security Beyond Probability (Duke University Press, 2013)

Chapter 4, "Governing by Algorithm," is particularly relevant to the ShotSpotter controversy. Amoore's broader argument — that algorithmic governance operates by assigning probabilities to uncertain futures and treating those probabilities as grounds for action — applies precisely to gunshot detection: the algorithm does not know whether a sound is a gunshot, but it assigns a probability, and that probability triggers police response. The chapter's treatment of algorithmic authority and its political effects provides the theoretical grounding for critiques of ShotSpotter that go beyond the specific accuracy question.

10. Rainforest Connection — Project Documentation and Impact Reports

Available at rfcx.org. The Rainforest Connection's own documentation of its Guardian technology, deployment contexts, and measured outcomes provides primary source material for Case Study 22-2. The organization publishes annual impact reports with data on detection events, ranger responses, and estimated forest protection outcomes. Reading these reports alongside the critical analysis in the case study models the kind of engaged but critical evaluation that empirical claims require — taking organizational self-reporting seriously while applying appropriate skepticism about incentives to present favorable outcomes.

For students interested in the acoustic ecology of urban environments specifically, Charles de Lint's "Thinking About Sound" (Canadian Acoustics, 2018) provides an accessible introduction. For those interested in the legal dimensions of acoustic surveillance evidence, the Electronic Frontier Foundation's analysis of ShotSpotter in criminal proceedings is available at eff.org and provides current case law alongside policy analysis.