Here, we test whether integrating mark–recapture data with passive acoustic detections into a joint likelihood improves estimates of population size in a multi‐guild community. These beneficial effects result from increasing sample size (through data pooling) and complementarity between different data types. All rights reserved.Ībundance estimation methods that combine several types of data are becoming increasingly common because they yield more accurate and precise parameter estimates and predictions than are possible from a single data source. This highly customisable and inexpensive system could greatly increase the scale and ease of conducting bioacoustic studies. The Solo recorder has been extensively field tested in temperate and tropical regions, with over 50,000 hours of audio collected to date. We also provide a video tutorial showing hardware assembly and documentation is available via a supporting website. We provide an example configuration costing £167 (£83 excluding suggested memory card and battery), which records audible sound continuously for approximately 40 days. Units are constructed from the Raspberry Pi single board computer and run easy-to-install and freely available software. Here, we present the Solo audio recorder. Although several commercial systems are available they are often expensive and are rarely user-serviceable or easily customised. Audio recorders are widely used in terrestrial and marine ecology, and are essential for studying many cryptic or elusive taxa. *** Please visit the accompanying website (linked as supplementary material in manuscript) for latest hardware updates *** ***.
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