Advancing the Science and Practice of Studying Avian Flight Calls

Many birds produce short vocalizations in flight. These calls provide evidence of birds moving overhead and offer unusual opportunities to investigate movements that are difficult to observe directly. Flight calls may accompany nocturnal or diurnal migration, dispersal, nomadic wanderings, and local movements. They can therefore inform research on migration, communication, ecology, evolution, population monitoring, and conservation.Flight-call monitoring is expanding rapidly. Autonomous recording units, affordable microphones, large public sound archives, and increasingly powerful detection and classification tools now allow researchers and enthusiasts to collect acoustic observations across extensive spatial and temporal scales. Recording systems are being deployed in backyards, along migration corridors and coastlines, at mountain passes, and in other locations where birds concentrate or move regularly. These efforts are producing unprecedented volumes of acoustic data and creating new opportunities for collaboration among researchers, practitioners, and community scientists.At the same time, interpreting flight-call recordings presents substantial challenges. Calls can be brief, variable, and similar among related species, while the birds producing them may be distant, invisible, or difficult to identify independently. The probability that a bird calls and that its call is recorded can vary with species, age, social context, behavior, flight altitude, weather, background noise, equipment, and recording configuration. Consequently, numbers of detected calls cannot necessarily be translated directly into numbers of birds or rates of passage. Automated systems introduce further questions about training data, validation, uncertainty, transferability among regions and recording systems, and the treatment of ambiguous or previously undocumented calls.These challenges occur in both nocturnal and diurnal settings. Although nocturnal flight calls have received particular attention because visual confirmation is rarely possible, daytime flight calls also present important questions concerning detectability, identification, sampling design, and ecological inference. Considering the two contexts together may reveal shared principles as well as meaningful differences in call structure, function, calling behavior, and the types of movement that can be studied.This Research Topic will bring together methodological, empirical, and synthetic contributions that strengthen the scientific foundations of flight-call research. We invite studies that develop or evaluate recording and sampling protocols; compare recording technologies; assess manual and automated methods for detection, annotation, and classification; and develop rigorous approaches to validation, uncertainty, and misclassification. We also welcome research integrating flight-call observations with independent sources of evidence, including radar, visual observations, telemetry, tracking, banding, weather data, and community-science databases. Case studies are also welcome, especially those drawing on long-term or multi-year flight-call datasets. Such contributions may document temporal changes in migration phenology, species composition, call activity, or other ecological patterns; evaluate responses to documented environmental change; or distill transferable lessons from sustained recording programs.By promoting shared standards, transparent reporting, careful validation, and reproducible analysis, this Research Topic aims to strengthen flight-call monitoring as a reliable and widely accessible approach to studying birds throughout their annual cycles.This Research Topic welcomes original research articles, methods papers, reviews, perspectives, data-oriented contributions and well-documented case studies. Topics addressed may include: • The behavioral, ecological, and evolutionary functions of flight calls • Similarities and differences between nocturnal and diurnal flight calls • Best practices for acoustic sampling design, recorder deployment, and system calibration • Effects of equipment, placement, weather, background noise, and flight altitude on detectability • Manual and automated detection, annotation, and classification • Validation, ground-truthing, and reporting of uncertainty in species identification • Variation in calling propensity and its consequences for estimating passage or abundance • Transferability and reproducibility of classifiers across species, regions, seasons, and recording systems • Integration with radar, visual surveys, telemetry, tracking, banding, weather data, and community-science observations • Sampling designs for studying movement geography, phenology, behavior, ecology, evolution, population trends, and conservation • Acoustic reference libraries, annotated datasets, metadata standards, data archiving, and reproducible analytical workflows • Geographic, taxonomic, and linguistic gaps in flight-call knowledge • Technological innovation in microphones, autonomous recording units, arrays, localization methods, and analytical software • Long-term and multi-year case studies of flight-call activity, migration phenology, and ecological change • Development, sustainability, and evaluation of regional monitoring stations and collaborative monitoring networks • Contributions of community scientists and approaches to training, feedback, data quality, and collaborative research Topic editors: W. Douglas Robinson Source: https://www.frontiersin.org/research-topics/85930/advancing-the-science-and-practice-of-studying-avian-flight-calls