Fig. 9

Multi-camera recording of vocalizing Asian elephants. Overview of scene. a Aerial photography of elephant enclosure in Copenhagen Zoo and the position of cameras (CAM 1–5) and elephants during video recordings. Used with permission from COWI. b, c Three-dimensional reconstructed scene viewed from behind the cameras (b), from the side (c), and from the top (d). e Audio spectrogram of the full duration of the video capture from the microphone in CAM 2. The 28 discrete vocalization events during the video capture are highlighted. Vocalization events 3, 4, and 28 were used in subsequent analyses of animal vibration. Position of relevant elephants during these events are displayed in a